Sightings summary: 2020

Annual overview of butterflies reported to the Dorset branch website*

88,561 adult butterflies of 49 species reported to the website this year.

Recording activity

Number of species records by date seen (scroll right for key).

Top butterflies

TIP Click chart segments to see numbers reported.

Species count

Total records by species.

First sightings

Earliest dates on which adult butterflies were reported to the website.

Species Date
Adonis Blue 27 Apr
Brimstone 19 Jan
Brown Argus 19 Apr
Brown Hairstreak 12 Jul
Chalkhill Blue 06 Jul
Clouded Yellow 19 Apr
Comma 19 Jan
Common Blue 26 Apr
Dark Green Fritillary 25 May
Dingy Skipper 14 Apr
Duke of Burgundy 02 May
Essex Skipper 14 Jun
Gatekeeper 09 Jun
Grayling 14 Jun
Green Hairstreak 08 Apr
Green-veined White 16 Mar
Grizzled Skipper 08 Apr
Holly Blue 25 Mar
Large Skipper 19 May
Large Tortoiseshell 03 Mar
Large White 24 Mar
Long-tailed Blue 10 Aug
Lulworth Skipper 07 May
Marbled White 19 May
Marsh Fritillary 26 Apr
Meadow Brown 17 May
Orange Tip 26 Mar
Painted Lady 03 Apr
Peacock 05 Jan
Purple Emperor 23 Jun
Purple Hairstreak 07 Jun
Red Admiral 02 Jan
Ringlet 05 Jun
Silver-spotted Skipper 03 Aug
Silver-studded Blue 25 May
Silver-washed Fritillary 07 Jun
Small Blue 25 Apr
Small Copper 24 Mar
Small Heath 22 Apr
Small Pearl-bordered Fritillary 27 May
Small Skipper 27 May
Small Tortoiseshell 19 Jan
Small White 01 Mar
Speckled Wood 21 Mar
Swallowtail 09 Aug
Wall Brown 08 Apr
White Admiral 04 Jun
White-letter Hairstreak 15 Jun
Wood White 19 Apr

Flight times

Duration between earliest and latest reported sightings of adult butterflies.

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*Please note: The charts shown on this page are drawn only from casual sightings submitted to this website. They are therefore not statistically significant, but do serve as an indication of what’s going on in the Dorset butterfly world. The records from this website will be added to a lot more data collected throughout the year, and used to compile the five-yearly Butterfly Atlases for Dorset and the UK. These are vitally important because they show the location of species and, over time, measure distribution changes and the possible effects of climate change. This gives us the information we need to help various species in appropriate ways.

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