A big year is a personal challenge or an informal competition among birders who attempt to identify as many species of birds as possible by sight or sound, within a single calendar year. == History of North American big years == The wide publication in 1934 of the first modern field guide by Roger Tory Peterson truly revolutionized birding.
A big year is a personal challenge or an informal competition among birders who attempt to identify as many species of birds as possible by sight or sound, within a single calendar year. == History of North American big years == The wide publication in 1934 of the first modern field guide by Roger Tory Peterson truly revolutionized birding.
Source: Wikipedia "Big year" · CC BY-SA 4.0
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