insectivores

Swift Apus apus parent visiting its nest in the eaves of a brick barn

House martin Delichon urbicum at nest in the eaves

House martin Delichon urbicum in flight showing tail and wing shape

Swift Apus apus in flight showing sickle shaped wings and dark stomach

Swift Apus apus and House martin Delichon urbicum comparison of the two birds in flight

Nesting tower for swifts, martins, & bats diagram showing the slots for bats, curved slits for swifts and nests for martins

Willow warbler Phylloscopus trochilus on branch showing green grey back and yellowish chest.

Barn swallow Hirundo rustica in flight, seen from below, with a small insect in its beak

Barn swallow Hirundo rustica viewed from above with small insect in its beak

Swift Apus apus sketch in flight