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Butterfly Blog

Small Blues shine despite the gloom

31/5/2026

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GH, LN and BG chose to go for transect 9 on a day when the week’s stifling heat was forecast to cool. What we got was warm, muggy weather with dense high cloud and only a few brief glimpses of the sun. 
The butterflies didn’t seem to think much of it either; this week’s count was our lowest since mid-April. 
But it wasn’t all gloom: the well established and now widespread kidney vetch is beginning to flower on Hither Field and here we saw 10 Small Blues, not forgetting a single SB on Great Parsons Field. 
This total of 11 SBs is our highest ever day’s count of these special little butterflies, a great reward for the work of the WoodChips in planting the kidney vetch to encourage them to take up residence on our site. 
Adding to the day's interest, we also recorded our first Large Skippers of the season, another sign that summer species are now beginning to emerge in earnest.
Count details:
​ 30 Common Blue
29 Small Heath
16 Large Skipper
11 Small Blue
7 Dingy Skipper
5 Meadow Brown
3 Holly Blue
2 Small Copper
2 Speckled Wood
1 Brimstone
1 Painted Lady
Count summary:
107 butterflies from 11 species.
If you would like to know more about any of the species mentioned, visit 
​
butterfly-conservation.org

First of the year

Picture
Small Blue - Liz North
Small Blue (Cupido minimus) – Britain's smallest butterfly
  • With a wingspan of just 16–27 mm, the Small Blue is the smallest butterfly in the UK, yet it can travel surprising distances between suitable habitats.
  • Unlike most blue butterflies, the males and females look very similar, both being predominantly brown above with a delicate dusting of blue.
  • Its caterpillars feed almost exclusively inside the flower heads of kidney vetch, making the butterfly highly dependent on this single plant for breeding.
  • When to see them in the UK: Typically May–June, with a partial second brood in July–August in favourable years and locations.
Large Skipper (Ochlodes sylvanus) – pictured at top.
  • Although called a butterfly, its chunky body, hooked antennae and rapid, darting flight give it a distinctly moth-like appearance.
  • Males have a distinctive dark scent mark across their forewings, used to release pheromones and attract females.
  • The caterpillars spend much of their lives hidden in rolled grass leaves, which they stitch together with silk to create a protective shelter.
  • When to see them in the UK: Typically June–August, with adults most numerous during July in sunny grasslands, woodland rides and field margins.
This week's survey by Graham Harris, Brian Gardner and Liz North submitted to 
​Butterfly Conservation (UKBMS).
​Report by GK, BG & AI.
​
Large Skipper header photo: Liz North.
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Record numbers again

13/5/2026

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GH, LN and BG walked transect 6 on a gloriously warm and sunny afternoon. Amazingly, this latest count of 252 butterflies followed those of weeks 4 and 5 by exceeding the previous week's total by around 50 and giving us another record count for the third successive week. This was mainly due to the continuing increase in Dingy Skipper numbers but also a strong showing from Brimstones, Grizzled Skippers, Holly Blues and Small Heaths and the first Common Blues, Brown Argus and Small Blues of the season. 
​And finally, after our disappointment last week, we also had the pleasure of recording our first Painted Lady of the year!
Count details:
​104 Dingy Skipper
51 Brimstone
22 Small Heath
21 Holly Blue
19 Grizzled Skipper
10 Green Hairstreak
8 Common Blue
6 Small Copper
4 Peacock
3 Orange Tip
1 Brown Argus
1 Painted Lady (pictured above)
1 Small Blue
1 Speckled Wood
Count Summary:
​252 butterflies from 14 species.
For more info on the species mentioned, visit butterfly-conservation.org
Painted Lady (Vanessa cardui) – the globe-trotting butterfly (pictured above)
  • One of the world’s greatest insect migrants, Painted Ladies travel thousands of miles from North Africa and southern Europe to reach the UK.
  • Unlike many butterflies, they don’t overwinter in Britain – each year’s population arrives as fresh migrants and their descendants continue the journey north.
  • Their caterpillars feed on a surprisingly wide range of plants, especially thistles, mallows and nettles.
  • When to see them in the UK: Most commonly seen from May–October, with numbers varying greatly depending on migration success.
A DIFFERENT KIND OF WEBSITE 
Picture
Ermine Moth caterpillars - Graham Kenward
Picture
Ermine Moth caterpillar webs - Liz North
Ermine Moth Caterpillars (Yponomeuta species) – tiny caterpillars with a talent for teamwork.
  • These caterpillars spin huge silken communal webs that can completely cover bushes and small trees (even grass in Chipstead valley), creating an eerie ‘ghostly’ appearance.
  • Hundreds of caterpillars may live together inside a single web, feeding safely on the leaves beneath their protective silk blanket.
  • Despite stripping branches bare, the host plants usually recover quickly once the caterpillars pupate and move on.
  • You will most likely see the webs and active caterpillars between May and June. The adult moths, which are white with black dots (resembling ermine fur), emerge in July and August
This week's survey by Graham Harris, Brian Gardner and Liz North submitted to Butterfly Conservation (UKBMS).
​Report by GK, BG & AI.
​
Painted Lady header photo: Brian Gardner.
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Another record week

3/5/2026

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Week 5’s transect was carried out by GH, LN, BG and by new-girl Luka, who clearly showed her keen interest and willingness to learn about butterflies. 
​Friday afternoon was selected for the survey as it was forecast to be very warm and sunny before the weather was set to deteriorate. Just as last week’s count was a week 4 record, week 5’s tally broke the record once again with 196 butterflies seen from 13 species. This was largely due to the surge in Dingy Skipper numbers. 
Our records for the past 10 years show that it’s extremely rare for count numbers to reach into the hundreds at this point in the year, let alone to surge as high as 159 and 196.
Just after we’d finished our walk we saw a Painted Lady, the first of the season but, sadly, off the transect.
Count Summary:
​76 Dingy Skipper
56 Brimstone
19 Holly Blue
11 Green Hairstreak
7 Small Copper
7 Small Heath
6 Peacock
5 Orange Tip
5 Grizzled Skipper
1 Comma
1 Large White
1 Small White
1 Speckled Wood
Total Summary:

196 butterflies from 13 species.
Picture
Small Copper - Liz North
Small Copper (Lycaena phlaeas) – a fiery flash in the grass
  • Despite its tiny size, it’s a bold and territorial butterfly, often chasing off intruders many times larger.
  • Its caterpillars feed on sorrel plants, making it a common sight in open grasslands, paths and even urban edges.
  • It can produce multiple broods in a single year, allowing numbers to build quickly in good conditions.
  • On the wing: Seen from April–October, with two or three broods depending on the weather.

For more info on the species mentioned, visit
butterfly-conservation.org

This week's survey by Graham Harris, Brian Gardner,  Liz North and Luka submitted to Butterfly Conservation (UKBMS).
​Report by GK, BG & AI.
Small Copper photo: Liz North.
​
Small Heath header photo: Liz North.
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    The Transect Team

    Here you'll find details and pictures from the team carrying out our regular  butterfly surveys (known as transects) over 26 weeks during Spring and Summer.

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  • Home
  • About Us
  • The area we cover
  • Featured creatures
  • Our Butterflies
    • Butterfly Blog
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