The Bronx County Bird Club was formed and would go on to lead the Audubon Society's Christmas Bird Count in the eastern US for three years in a row.

The Bronx County Bird Club (BCBC) was a small informal club of birders based in the Bronx, New York, active between 1924 and 1956, with residual activity through 1978. The club was a major participant in the Audubon Society's Christmas census, observing more species in the eastern US than any other team for three consecutive years. Club members Roger Tory Peterson, Joseph Hickey, Allan Cruickshank, and William Vogt became well-known ornithologists and authors.

The Christmas Bird Count (CBC) is a census of birds in the Western Hemisphere, performed annually in the early Northern-hemisphere winter by volunteer birdwatchers and administered by the National Audubon Society. The purpose is to provide population data for use in science, especially conservation biology, though many people participate for recreation. The CBC is the longest-running citizen science survey in the world.