swift

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

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

Swift Apus apus compared to  passerine wing shape and bones diagram

Weasel Mustela nivalis cut to white, curled around and looking out at the viewer