Brown hairstreak butterfly (thecla betulae) resting on grass seedhead, oxfordshire, uk

terrestrial invertebrate animals brown wildlife grass cold insects entomology wood insect betulae resting ectotherms british developed country bugs arthropoda england uk butterfly butterfly winged woodland thecla ectothermic europe uk britain lycaenidae blooded seedhead arthropods nature summer united kingdom insecta vertical countryside lepidoptera diurnal arthropod english zoology oxfordshire insect invertebrates developed countries hairstreak butterflies european butterflies verticals ectotherm bug fauna animal