Mill Hill (June 2013)
Spring Downland Butterflies (May):
Adonis Blues (Photograph by Andy Horton)
Dingy Skipper (Photograph by Andy Horton)
Small Heath Butterfly
Grizzled Skipper
Adonis Blue Butterfly
Dingy Skipper
Small Heath Butterfly

Noticeable summer plants of the upper meadows include Greater Knapweed, Hardheads (=Lesser Knapweed), Field Scabious, Meadow Cranesbill, Alexanders, Pyramidal Orchids, Plantains, Melilots, Meadow Vetchling, Yarrow, Eyebrights, Musk Thistles, Hounds-tongue*, Perforate St. John's Wort*, Great Mullein* and many others. Herb Robert is found amongst the scrub.
(*notably on disturbed ground.)

Some Indicator Plants of Ancient Downland

Horseshoe Vetch (Photograph by Andy Horton)
Autumn Gentian
Horseshoe Vetch
Common Milkwort
Dog Violet
Autumn Gentian

Other indicators on the lower slopes include Dropwort, Autumn Ladies Tresses (upper plateau), Hairy Violet, all of which are rarely found on pastures, restored wildlife meadows or agricultural downland. Other downland plants that are more likely on the biodiverse down herbland are Wild Thyme, Carline Thistle, Dwarf Thistle, Squinancywort, Fairy Flax, Small Scabious, Common Centaury and Wild Basil. There are other more widespread wild plants like the Mouse-eared Hawkweed, Rough Hawkbit, Lesser Hawkbit, Bird's Foot Trefoil, Ground Ivy, Germander Speedwell, Field Speedwell, Sweet Violet, Self-heal and Yellow Wort.
Wild Flora and Fauna on Chalk   flickr
Adur Wild Flowers 2009


A large part (724 acres) of the downs including Mill Hill were presented to the people of Shoreham in 1937

Lower Slopes of Mill Hill, May 2006 

Just over 30 acres still remain as public open land and a Local Nature Reserve.  This is divided into about 11 acres of grassland and meadows above the ridge, about 9 acres of scrub, the copse and glades at the northern end, and about half of the prime Chalkhill Blue area of 6.4 acres of herbland remaining. 6 acres has been lost to a Sycamore woodland on the southern slopes. 

This is low fertility chalkland not suitable for grazing. The top area is effectively a wild meadow and the lower slopes a rabbit warren dominated by prostrate (not the upright form) Horseshoe Vetch, Hippocrepis comosa

Link to the Mill Hill web page for 2009

Horseshoe Vetch

Chalkhill Blues:

Mill Hill is nationally important because of its population of Chalkhill Blue Butterflies. Estimates of the numbers are notoriously inaccurate. In the 1950s the population was estimated by R. M. Craske to be 50,000. This may be an exceptionally good year. I would estimate the numbers at that time to be nearer 25,000 for Mill Hill only. After the cattle grazing and thorn incursions the numbers plummeted to the most reliable estimate in 1960 of 6,000. The new road and Sycamore woodland further denuded the Horseshoe Vetch, Hippocrepis comosa, and bare chalk downland to a figure I have estimated at a top figure of 3,000 Chalkhill Blue Butterflies at the turn of the millennium (counted in 2003). Almost all these butterflies are now to be found on the six acres of the lower slopes.
Graham Hart in the 1990s estimated the numbers at 6,000. This is not out of the question and this would accord with the R. M. Craske estimate of 50,000. This would be the maximum population density that could be expected on the carpets of Horseshoe Vetch (based on German figures).
Protection of the current population requires man management of the scrub incursions, which means removal of the Privet

Text by Andy Horton Calcareous Grassland Message
"Our family lived at The Mill House, Mill Hill, from around 1933 until about 1967, and every July we saw the "Butterfly Men" walking past onto the Downs. My father used to tell us that they were interested in the blue butterflies."
Heather Clark (née Eager), Ryde, Isle of Wight
Nearest Postcode:  BN43 5FH
Grid Ref:  TQ 21170 07444  (upper car park)
Geographic Link      OS Map
Google Earth Map
Magic Map of Mill Hill NR
Local Nature Reserve Designation
Natural England: Local Nature Reserves
Multi-Map (Bird's Eye View)
Grid Reference Finder

Threats to the Butterfly Downland site at Mill Hill
The butterfly lower slopes at Mill Hill are under serious threat by a natural process known as ecological succession where the woody shrubs like Privet, Brambles and Hawthorn invade the herb-rich slopes gradually turning the downs into woodland and eliminating the butterfly larval food plants especially the Horseshoe Vetch, Hippocrepis comosa, on which the Chalkhill Blue Butterflies rely. The remedy is by expert professional removal of the Privet on a regular basis. This job is now being undertaken by volunteers. 


Mill Hill on

Mill Hill on


OS Map

   Footpaths at Mill Hill

Map Geograph Satellite



17 July 2017
Butterflies were fluttering all over Mill Hill with sixteen of the expected species. Common Blues (100+)  were all over the top of the hill where I spotted a Brown Argus almost immediately. Chalkhill Blues (55+) were widespread with most over the lower slopes where I was pleased to see my first Clouded Yellow of the year.
Butterfly List of the Day

Mint Moth, Hoverfly Chrysotoxum festivum
Round-headed Rampion
Brown Argus

On the upper plateau of Mill Hill I recorded my first Round-headed Rampion flower of the year. This flower is easily overlooked. Not so the Musk Thistle where I made a quick search and found my first of this flower of the year when most of the plants had already gone to seed. My first Ploughman's Spikenard was also spotted on the ridge rather than the lower slopes. I spotted my first ever pyralid micro-moth Mint Moth Pyrausta aurata on the middle slopes of Mill Hill, visiting Marjoram. Also, the hoverfly Chrysotoxum festivum was found in the same area on Wild Parsnip and other flowers.
Wild Flower Images of the Day

10 July 2017

Wild Basil, Greater Knapweed, Painted Lady, Chalkhill Blue
Dwarf Thistle, Perforate St. John's Wort & Wild Basil, Robin's Pin Cushion, Meadow Grasshopper nymph
Lower Slopes of Mill Hill

On the southern part of Mill Hill, I noted quite a few Meadow Browns, a Comma and Silver Y Moths. On the steps down to the lower slopes a Speckled Wood showed in the shade before I was distracted by a Peacock and my first Painted Lady of the year. Scores of butterflies fluttered around on Mill Hill including my first dozen or so of the first male Chalkhill Blues of the year over the lower slopes. On a warm sunny afternoon, all the butterflies were extremely lively especially over the large patch of Wild Basil at the northern end of lower slopes where they were joined and disturbed by frequent Small Heaths, Gatekeepers, male Common Blues and Marbled Whites., a couple of Brimstones, a Red Admiral, a Small White, and a Large White. I only visited the northern end of the lower slopes for under an hour. From the path I also spotted lots more Meadow Browns and Marbled Whites, Gatekeepers and 6-spotted Burnet Moths as I returned hurriedly. Robin's Pin Cushion was spotted and the yellow Lesser Hawkbit identified on the lower slopes. I did manage to add a brownish Small Skipper to the list amongst the Greater Knapweed and many grasses south of the Reservoir.
Adur Butterfly List 2017

5 July 2017
A rustle in the dense but very short vegetation on the lower slopes of Mill Hill was recognised with a clear view of a Common Lizard, Zootoca vivipara, which may have been after a Meadow Grasshopper, Chorthippus parallelus. Some  vegetation like Privet was alarmingly everywhere blocking off half the lower slopes, whereas other flowers like Marjoram, the tall Great Mullein, Wild Mignonette, the diminutive Squinancywort, Dwarf Thistle, Wild Basil, Field Scabious, Small Scabious, were attractive natives coming into bloom. Welted Thistle was seen on the ridge, but Musk Thistle seems to have disappeared and likewise Meadow Cranesbill.
Adur Lizards

Marjoram, Self-heal, Squinancywort, Dwarf Thistle
Welted Thistle, Vervain, Gatekeeper, Wild Basil

Meadow Browns (50+) were all over Mill Hill and Marbled Whites (25+) were frequent too, but there were not many butterflies for summer and not many species, frequent fresh Gatekeepers, an occasional Small Heath a few Large Whites and Small Whites. Looking out for blues, I disturbed a Treble-bar Moth and a Silver Y Moth, and spotted a 6-spotted Burnet Moth.
Adur Butterfly List 2017

19 June 2017

Bird's Foot Trefoil

The chalk downs above Shoreham were swathed in the yellow of Bird's Foot Trefoil, on the middle slopes of Mill Hill and New Erringham pasture to the east of Mill Hill Nature Reserve. A Rook soared like a Buzzard in the mostly blue sky on the warmest air temperature of the year reaching 25.6 °C at 10:00 am and 26.1 ° C at 11:00 am when I was on Mill Hill.

Common Ragwort, Knapweed Broomrape, Dropwort, Bramble
Yellow Wort, Common Green Grasshopper, Agrimony, Comma Butterfly

Butterflies were very frequently seen but not much variety, twenty five or so Meadow Browns amongst the long vegetation on the top part of Mill Hill south of the Reservoir with many more wall hidden with at least one, probably more, Silver Y Moths. On the Privet covered lower slopes, the lively Marbled White Butterflies (18+) merged well with the flowerheads of the invasive Privet bushes, Small Heath Butterflies (18+) courted in the gaps between the bushes with a few male Common Blues and one Small Tortoiseshell on my less than one acre transect walk. Frequent tiny pyralid moths Pyrausta puperalis, flitted amongst the low herbs. Grasshoppers were stridulating in the sunshine. At lest one ws the Common Green Grasshopper, Omocestus viridulus.

Yellow Wort

There were at least a dozen Meadow Browns, half a dozen Small Heaths, and another four Marbled Whites on my passage return over the middle and top part of Mill Hill north of the Reservoir. Add to my tally a Brimstone, Comma and three more Small Tortoiseshells on the fringes of the scrub.

The morning flowering Yellow Wort was both attractive and common, possibly as many as I had ever seen before on both the lower and middle slopes where the soil is shallow and undisturbed. There was the yellow of the upright Rough Hawkbit and Mouse-eared Hawkweed, and the ground hugging Silverweed on and around the ridge. Vervain was noted for the first time next to the path, and the diminutive Eyebright had been flowering for sometime but not previously mentioned. A handful of Pyramidal Orchids were seen scattered around as single spikes.

This was found with Knapweed on Mill Hill, but I am not sure which species?
I think it is Knapweed Broomrape from previous records compared.

Lastly, I eventually found some Knapweed Broomrape after a search on the southern top part of Mill Hill.
Mill Hill Flower Montage

13 June 2017
At last the breeze was gentle (Force 3) on a sunny humid day. The white flowers of Elderflower, Privet and Bramble were dominant in the landscape. Privet threatened to overrun the lower slopes of Mill Hill and certainly blotted out many of the Dropwort flowers. In the bare patches Yellow Wort opened its flowers in the morning.

Wild Thyme, Greater Knapweed, Dropwort
Silver Y Moth, Yellow Wort, Agrimony

On the southern top part of Mill Hill I stumbled across a Small Tortoiseshell, a pale green Brimstone and a male Common Blue Butterfly in the late morning. On the lower slopes the flowering Privet had grown up so much that I did not complete my normal transect walk and just made a cursory unhurried visit. Brimstone Butterflies patrolled as usual and one pair was courting. Frequent Small Heath Butterflies were harder to spot because of the excessive Privet, with occasional larger Meadow Browns and some blue butterflies. There were a handful of battered and ragged blue butterflies. I have a tendency to think that at least four were the surviving remnants of the first batch of male Adonis Blues. I disturbed about seven Cinnabar Moths which was an unprecedented number in a hour. A pale Silver Y Moth settled in front of me. The pyralid micro-moth Pyrausta despicata was spotted occasionally on the lower slopes of Mill Hill.
Adur Butterfly Report

3 June 2017
A Peregrine Falcon made three passes at a Buzzard over the southern steps on Mill Hill, before both birds of prey flow off on a windy late afternoon. On the same day the Buzzard descended and caught a Rabbit which it flew up with, only to be mobbed by a Crow.

Peregrine Falcon altercation with a Buzzard
over Mill Hill
Photograph & comments by Etienne Fournier

On the same day the Buzzard descended and caught a young Rabbit which it flew up with, only to be mobbed by a Crow.
Photograph & comments by Etienne Fournier

My Mill Hill transect  produced Adonis Blue 28, Brimstone 2, Peacock, Red Admiral, Small Heath 19, Small Tortoiseshell 3. Moths: Cinnabar (Tyria jacobaeae) 3, Burnet Companion (Euclidia glyphica), Common Purple and Gold (Pyrausta purpuralis), Hook-streak Grass veneer (Crambus lathoniellus), Lesser Treble-bar (Aplocera efformata).

Report by Colin Knight on Butterfly Conservation Sussex Sightings

22 May 2017

Adonis Blues

On the lower slopes of Milll Hill, I tried to count the Adonis Blues in the designated one acre transect area (which now takes me half an hour to traverse if I do not pause) but at the count of 91 (including seven females), the numbers were too many together at the northern end to get an accurate count but estimated at 125 in the acre (10% females). They were accompanied by frequent Common Blues which almost all appeared to be males.  A few Adonis Blues mated. Others were chased by the frequent amorous Small Heaths. Brimstone Butterflies were incessantly on patrol, although one did visit a Bramble flower. Two Dingy Skippers courted and one was seen alone. They were drabber than a Mother Shipton Moth of the same size and similar behaviour. A Peacock Butterfly flew overhead and was seen to be intact when it later landed. The most distinctive find were three Cinnabar Moths which quickly disappeared into hiding. Altogether there was not much variety which included a single Green-veined White. I only visited the lower slopes of Mill Hill, but access was over the top southern part and it looked as though there may have been a late in the day emergence of Common Blues as they were occasionally disturbed on passage.

Horseshoe Vetch, Hippocrepis comosa, abundantly covered the slopes but thousands of flowers were withering to seed. The first Dropwort buds and tiny flowers were on show, and I spotted a miniature Fairy Flax. The hoverfly Merodon equestris and theThick-legged Flower Beetle, Oedemera nobilis, visited Bramble flowers. Looking up on occasions to the blue sky, there were no birds of prey to be seen. I saw what may have been the white rump of a Wheatear flying over the lower slopes as I was leaving by the southern steps.

21 May 2017

Lower slopes of MIll Hill from the ridge
Annington (distance) and Old Erringham Farm in the background

As a weak sun was shining, I made a quick visit to the upper part of Mill Hill, where a female Adonis Blue landed on the path in front of me just above the ridge. Occasional Brimstones were the most prevalent butterfly in the late morning fluttering strongly around the scrub, where I was surprised to see a lively female Holly Blue. Small Heath Butterflies  fluttered around in the shorn vegetation.

Other butterfly visitors commented on the dearth of butterflies on the top of Mill Hill although they could add two Small Coppers and some Common Blues to my tally.
Adur Butterfly Report

16 May 2017
Mill Hill was covered in glorious swathes of the yellow of Horseshoe Vetch, Hippocrepis comosa, flowering the slopes, mostly the steep slopes and lower slopes but also some quite large patches on the upper part of the hill.

Butterflies were common (over a hundred) for the first time this year with male Adonis Blues leading the way with sixty plus and a few flighty females. About twenty male Common Blues were seen for the first time this year with frequent Brimstone Butterflies, frequent Small Heaths, just two Grizzled Skippers, and one of each of Dingy Skipper, Peacock, Speckled Wood, a first of the year Wall Brown, Red Admiral, and a Green-veined White. That made for eleven different species, the most this year in over an hour on Mill Hill, and it was only sunny for some of the time and one cloud let loose a few drops of rain. I also spotted a Treble-bar Moth and my first of the year pyralid micro-moth Pyrausta nigrata. Graeme Rolf also spotted two Green Hairstreaks and three Cinnabar Moths. The small beetle Isomira murina was recorded for the first time.
Full Butterfly Report

9 May 2017

Adonis Blue
Mill Hill

Summer seemed to have put in its first appearance with the glorious blue of my first male Adonis Blue Butterfly of the year. It appeared on the lower slopes of Mill Hill at 3:00 pm with the sun still behind the fluffy cirrus clouds. It was the first of about ten, nine in perfect condition, but one slightly torn and ragged.

Swathes of the bright yellow flowers of the Horseshoe Vetch, Hippocrepis comosa, covered the slopes. This vitally important butterfly food plant was virtually at is peak flowering. I noted a couple of Dog Violets amongst the yellow exuberance.
Two Green-veined White Butterflies, three bright yellow Brimstones Butterflies, a worn Peacock Butterfly and the first of the dozen or more Small Heath Butterflies showed after five minutes or so. A flash of bright crimson was my first Cinnabar Moth of the year. My first damselfly of the year, a Large Red Damselfly, flitted around the short vegetation.

Grizzled Skipper, Dingy Skipper
Adonis BlueLarge Red Damselfly
Mill Hill

Nine species of butterfly were seen on Mill Hill, but I had to wait around for an hour before a spell of sunshine enticed a veritable flurry of activity and the appearance of the skippers, including my first of only a few (maybe just one or two seen several times) Dingy Skippers of the year. Grizzled Skippers were  discovered mating on a Bramble shoot. A flash of orange was a surprise Small Copper Butterfly which was another first for two years. A Red Admiral was seen at the top of the southern steps as I left after an hour and half. The first shoots of Yellow Wort were spotted.

4 May 2017

Horseshoe Vetch, Andrena bee, Milkwort, Mouse-eared Hawkweed
Carline Thistle, Hounds-tongue, Small Heath Butterfly

Too breezy for photography, too cool for butterflies, and my days are numbered for scrambling about on steep hillsides. Nevertheless the Horseshoe Vetch, Hippocrepis comosa, was flowering in abundance on he lower slopes of Mill Hill with most yet to burst out into full bloom. Three Swifts darted to and fro over the upper plateau at great speed, possibly feeding on small flies. Half a dozen or more Jackdaws were attracted to the steep slopes amongst the Horseshoe Vetch (corvids seen at this time of year more often than not), joined by a few Crows and Magpies. At least one of the Jackdaws was collecting nesting materials of small dried grasses and sundries of which there was plenty on the slopes. Red-tailed Bumblebees and Honey Bees were frequently seen visiting the Horseshoe Vetch. And I stayed long enough to record three Peacock Butterflies on the edges of the scrub on the middle slopes, three Grizzled Skippers on the lower slopes followed by my first Small Heath Butterfly of the year. Hounds-tongue was very frequently seen on some cleared ground above the winding footpath through the lower slopes, and just one Mouse-eared Hawkweed by the gate to Old Erringham pastures. No Violets were casually spotted on the lower slopes, but frequent Milkwort was on the upper plateau (immediately south of the upper car park) scattered with more Horseshoe Vetch.

Wayfaring Tree

One Wayfaring Tree bush was in blossom at the northern end of the lower slopes on Mill Hill. Birds were in good voice from the bushes. I think I recognised the song of a Chiff-chaff.
1 May 2017
Lackey Moth Caterpillars in their silken tent on Blackthorn on the upper part of Mill Hill, with Slow Worms, both found south of the Reservoir on a rainy day.
Adur Moths

30 April 2017
At Mill Hill, to help find some roosting Grizzled Skippers. By now everything was asleep, but a careful search of the scrub revealed 5 snoozing Grizzled Skippers, 2 dozing Dingy Skippers, 3 sleepy Small Heaths and a comatose Brown Argus (which may be a national first for the year).

Report by Neil Hulme on Butterfly Conservation Sussex Sightings

I walked Mill Hill late morning in the fading 'grey' sun and in the sheltered areas out of the cool easterly breeze at the bottom of the steep slope, I counted at least 12 Grizzled Skippers, 10 Dingy Skippers, 3 Small Coppers, 4 Small Heath and one very fresh and surprisingly sprightly Adonis Blue that wouldn't pose long enough for a picture.

Report by David Cook on Butterfly Conservation Sussex Sightings

19 April 2017

Horseshoe Vetch

On the lower slopes of Mill Hill, the first hundred or so flowers of Horseshoe Vetch, Hippocrepis comosa, were showing along with the the first flowers of Milkwort. Young Privet was everywhere over the southern part of the lower slopes. coming back vigorously every year and threatening to shade out the chalkhill plants. There was not much to see: a group of five Rooks, Slow Worms and a Common Lizard on the top part. On the lower slopes two Peacock Butterflies and two Grizzled Skippers were reluctant to settle within camera range. I spotted a worn small pyralid moth Pyrausta despicata, and frequent micro-moths Pancalia leuwenhoekella and many small spiders running in the short vegetation. Pyrausta nigrata was not seen. Two Common Bee-flies hovered around the lower slopes.

15 April 2017
It was cold and cloudy at Mill Hill this morning with nothing flying but eventually the sun came out for a few minutes and I managed a picture of a Green Hairstreak. The wings look slightly crumpled so maybe they weren't quite dry (though it was able to fly).

Report by John Williams on Butterfly Conservation Sussex Sightings
14 April 2017
Noticing it was warm and with half an hour to kill before lunch I popped up to Mill Hill. I had been on the slope less than 15 seconds when a Small Heath settled on the grass beside me. There were also plenty of Grizzled Skippers. This was the first sighting of a Small Heath for Sussex.
Report by Jonathan Crawford on Butterfly Conservation Sussex Sightings

9 April 2017

Adonis Blue larva with ant
Photograph by Su Reed

I accidentally caught an Adonis Blue, Polyommatus bellargus, larva complete with it's attendant ant while trying to scoop up the spider!  I was amazed, what a find! I knew they were there, and I knew others had seen them but I never expected to find one myself.

Report and Commentary by Su Reed
According to Butterfly Conservation :-
The green larvae are well camouflaged and are nearly always attended by ants, which are attracted by secretions from special 'honey' glands and pores. Any ant species appears suitable, but the most common are the red ant Myrmica sabuleti and the small black ant Lasius alienus. The ants protect the larvae from predators and parasitoids, and even bury the larvae (in groups of up to eight) in loose earth cells at night.'

The ant in the photograph is probably the Meadow Ant, Lasius flavus. There is no certainty that the caterpillar is the Adonis as it could be the Chalkhill Blue. Because of the date I think the Adonis Blue is much more likely.

7 April 2017

Grizzled Skippers

A pair of Holly Blue Butterflies fluttering high in the trees at the top of Chanctonbury Drive, north Shoreham, were my first of the year. This is on the way to Mill Hill, where the highlight on the lower slopes was another first of the year: a pair of mating Grizzled Skippers on a dead Carline Thistle plant. Dog Violets were now the dominant violets on the lower slopes. On a hazy late afternoon, there was not much movement, my first Swallow of the year flew over the Blackthorn in blossom, a Kestrel hovering and descending on ot the steep slopes, a handful of Peacock Butterflies and a Small Tortoiseshell, the fattest Slow Worm I have ever seen, Common Bee-flies, bumblebees, small hoverflies, and frequent active small Alopecosa spiders crawling amongst the short vegetation. At least two species of micro-moth flitted around in amongst the short herbs, including occasional Violet Cosmet Moths, Pancalia leuwenhoekella.
Adur Butterfly List 2017
Adur Skippers

6 April 2017
At least 2 Grizzled Skippers have emerged on Mill Hill. 3 Brimstone, Small White, Green-veined White, Small Tortoiseshell, Comma and several Peacock in half hour walk at lunchtime today.

Report by David Cook on Butterfly Conservation Sussex Sightings

2 April 2017
I went back to Mill Hill with Chris Corrigan. There were plenty of micro moths including a number of Small Purple and Gold. I also saw a Toad and a couple of Common Lizards. There were butterflies about including Brimstone, Peacocks, Small Tortoiseshells, Speckled Woods and a single Red Admiral. About ten minutes after I had abandoned all hope, I caught sight of a Grizzled Skipper out of the corner of my, sitting on vetch. It was amazingly vivid so had probably just emerged. Unfortunately in the fumble for my camera I took my eye off butterfly and it was gone. Half an hour of searching failed to find it again. Fortunately, some time later Chris spotted a second one just six feet in front of the spot Neil had deemed propitious. This was the earliest sighting of a Grizzled Skipper in England for 2017.

Report by Jonathan Crawford on Butterfly Conservation Sussex Sightings

31 March 2017

Lower Slopes, Dog Violets. Dog Violet, Sweet Violet
Common Bee-fly, Slow Worms, Hawthorn
Mill Hill

Peregrine Falcon soared and rose of the thermals over Mill Hill on a sunny but breezy (steady Force 5) afternoon. The Dog Violets were already flowering on the lower slopes, in roughly equal numbers with Sweet Violets. A Common Bee-fly buzzed around the lower slopes, which were sheltered from the easterly breeze. Peacock Butterflies were courting high into the blue sky. After the falcon had flown away a Skylark could be heard but scarcely seen, .
Adur Violets

15 March 2017
I cycled to Mill Hill, where a Peacock Butterfly put in appearance over the pasture north of the Bridge, east of the road followed by a Comma Butterfly. Only a few Sweet Violets were scattered over the lower slopes of Mill Hill, so I ventured not much further than the southern steps, but I spotted a handful of Peacock Butterflies in as many minutes.

A Buzzard soared over Mill Hill where I also found my first Slow Worm of 2017.

9 March 2017
The sun came out and the air temperature measured 14° C at its highest at 4:00 pm. A Crow mobbed a small (male?) Kestrel high over the ridge. A clump of Daffodils was flowering.


Mill Hill Wildlife Reports 2015 (Link)
Mill Hill Wildlife Reports 2014 (Link)
Mill Hill Wildlife Reports 2013 (Link)
Mill Hill Wildlife Reports 2012 (Link)
Mill Hill Wildlife Reports 2011 (Link)

Adur Valley & Downs on facebook

Identification of Grasses (Link)
Mill Hill Grasses


(Estimated numbers for Mill Hill Nature Reserve only are in brackets)

Chalkhill Blue (3000 +)
Adonis Blue (50 -100)
Dingy Skipper  (75)
Small Heath (250)
Wall Brown  (12)
Meadow Brown  (300)
Marbled White  (50)
Gatekeeper    (200)
Speckled Wood  (>50)
Green-veined White (2+)
Common Blue  (>4000+)
Small Blue       (5)
Brimstone        (8)
Small Skipper   (>50)
Large Skipper   (10+)
Grizzled Skipper  (20)
Brown Argus   (>30)
Green Hairstreak ( a few)

The other species may breed on Mill Hill, but there main breeding area will be adjoining fields or slightly further away. e.g. Small Blue (included above), Small Copper, Small Tortoiseshell, Green-veined White, Peacock, Ringlet, Small White, Large White, Comma, Holly Blue, Orange Tip. (=10)

The following are immigrants &/or hibernators:  Red Admiral, Painted Lady, Clouded Yellow.

The following have not been positively identified (because of ID difficulties):  Essex Skipper. This species is now included for a local field on the Adur Levels within 500 metres of Mill Hill.


The following was confirmed only in 2009: Green Hairstreak.

The following was confirmed only in 2014: Dark Green Fritillary

The next one is no longer found on Mill Hill but were there in the distant (1947) past: Grayling.
The next one has been recorded near Mill Hill in the middle distance past:  White-letter Hairstreak


The Silver-spotted Skipper does not appear to ever have occurred on Mill Hill
The Silver-studded Blue has never been recorded from Mill Hill

The Short-tailed Blue was recorded as a single immigrant in 1956.

17 August 2009
A possible (unconfirmed) Brown Hairstreak Butterfly was spotted. A confirmed one was spotted nearby.

Adur Butterfly Page


History of Mill Hill

Aerial Map
Lower Adur Levels (MultiMap) including Lancing Clump and Mill Hill

Horseshoe Vetch, Hippocrepis comosa
First Draft of the Article for the Shoreham Society Newsletter

Link to the Adur 2012 Nature Notes pagesLink to the Adur Nature Notes 2011 web pages

Link to the Adur 2010 Nature Notes pagesLink to the Adur Nature Notes 2009 web pagesLink to the Adur Nature Notes 2008 web pagesLink to the Adur Nature Notes 2007 web pages
Link to Adur Valley Nature Notes 2003Link to the Adur Nature Notes 2004 Index pageLink to Adur Nature Notes 2005  Index pageLink to the Adur Nature Notes 2006 web pages