Sightings summary: 2021

Annual overview of butterflies reported to the Dorset branch website*

66,926 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 details.

Species count

Total records by species.

First sightings

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

TIP: Click column headers to sort table data.
Species Date
Adonis Blue 2021-05-07
Brimstone 2021-01-22
Brown Argus 2021-04-26
Brown Hairstreak 2021-07-20
Chalkhill Blue 2021-07-16
Clouded Yellow 2021-03-19
Comma 2021-02-26
Common Blue 2021-05-02
Dark Green Fritillary 2021-06-07
Dingy Skipper 2021-04-19
Duke of Burgundy 2021-04-24
Essex Skipper 2021-06-25
Gatekeeper 2021-06-24
Glanville Fritillary 2021-05-30
Grayling 2021-06-30
Green Hairstreak 2021-04-04
Green-veined White 2021-04-04
Grizzled Skipper 2021-04-17
Holly Blue 2021-04-04
Large Skipper 2021-05-29
Large Tortoiseshell 2021-02-26
Large White 2021-04-03
Lulworth Skipper 2021-05-26
Marbled White 2021-06-11
Marsh Fritillary 2021-05-10
Meadow Brown 2021-06-06
Orange Tip 2021-03-27
Painted Lady 2021-02-22
Peacock 2021-02-05
Purple Emperor 2021-07-16
Purple Hairstreak 2021-06-22
Red Admiral 2021-01-20
Ringlet 2021-06-23
Silver-spotted Skipper 2021-08-04
Silver-studded Blue 2021-06-09
Silver-washed Fritillary 2021-05-27
Small Blue 2021-05-11
Small Copper 2021-04-02
Small Heath 2021-04-26
Small Pearl-bordered Fritillary 2021-06-13
Small Skipper 2021-06-20
Small Tortoiseshell 2021-02-26
Small White 2021-03-09
Speckled Wood 2021-02-27
Swallowtail 2021-06-10
Wall Brown 2021-04-24
White Admiral 2021-06-15
White-letter Hairstreak 2021-06-28
Wood White 2021-04-27

Flight times

Duration between earliest and latest reported sightings of adult butterflies.

Seen a butterfly? Report a sighting

*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.

Explore the sightings archive.