| GOULD | Ornithologist who wrote Birds of Great Britain (5) |
| LORRIE | Moore who wrote "Birds of America" |
| COHEN | Leonard who wrote "Bird on the Wire" |
| AUDUBON | John James, U.S. ornithologist who wrote the illustrated book The Birds of America (7) |
| HUDSON | Naturalist and ornithologist who wrote books including Green Mansions, Far Away and Long Ago and A Shepherd's Life (6) |
| OSTEAL | Bony bird of great size (6) |
| ODDIE | Ornithologist who co-presented the first four series of Springwatch (5) |
| SCOTT | Peter -; ornithologist who founded what is now known as Slimbridge Wetland Centre (5) |
| BEWICK | English ornithologist who developed the technique of wood engraving and wrote A History of British Birds (6) |
| OOLOGIST | Description or title of an ornithologist who specialises in the study of bird's eggs (8) |
| GOODERS | Teacher-turned-ornithologist who penned books including A Day in the Country, The Outdoor Guide to Britain and, perhaps his most notable, Where to Watch Birds (7) |
| OOLOGISTS | Ornithologists who study or collect wild birds' eggs (a former pastime of "eggers", now illegal without a licence) (9) |
| EXHUME | Disinter old ornithologist who founded the Congress party (6) |
| TALON | Bird's claw ornithologist alone comprehends (5) |
| ROOST | Raised threat, so ornithologist hides nest (5) |
| BIRDS | What does an ornithologist study? (5) |
| RINGERS | Carillonneurs; ornithologists who place ID tags on birds' legs; or, quoits thrown so as to encircle pegs (7) |
| PENNA | Feather, to an ornithologist |
| SALIM | Indian ornithologist and naturalist (First name) |
| NESTS | Structures built by the vertebrates studied by ornithologists (5) |
