David Allen Sibley Quote

It can be difficult to accept the fact that a lot of birds have to be identified as possible or probable.

David Allen Sibley

It can be difficult to accept the fact that a lot of birds have to be identified as possible or probable.

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About David Allen Sibley

David Allen Sibley (born October 22, 1961, in Plattsburgh, New York) is an American ornithologist. He is the author and illustrator of The Sibley Guide to Birds, which rivals Roger Tory Peterson's as the most comprehensive guides for North American ornithological field identification.
Sibley has also authored a follow-up book, The Sibley Guide to Bird Life & Behavior.