Lesser Goldfinch

How do you tell a Lesser Goldfinch from an American Goldfinch?

Lesser Goldfinch_b

Lesser Goldfinches are smaller in size, have greenish backs, and are not as bright yellow. Their bills are pale. American Goldfinch bills are pink and conical.

Lesser Goldfinch_a

Collective nouns include- “007”, “charm”, “rush”, “treasury”, and “vein” of goldfinches.