How many letters does the top answer for “the study of young birds.” have?

The most common answer is neossology (10 letters).

Crossword clue: the study of young birds.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

neossology 10 letters web-def

The study of young birds.

a young bird. thackeray. 50% similar → birdikin

a zoologist who studies birds 50% similar → ornithologist

to chirp, as a young bird. 50% similar → cheep