Grafton Wood has 31 species of Butterfly identified counted by weekly Transect counts over the 17 years. The average yearly count is 3200 butterflies and a peak of 4800
Key Species – Brown Hairstreak - White Admiral - Brown Argus – Purple Hairstreak - Silver-washed Fritillary White Letter Hairstreak, Dingy and Grizzled Skipper and Wood Whites have also been recorded.