a) Sand martin
b) Cave swallow
c) Fairy martin
d) Brown-chested martin
Answer: a) Sand martin. The bank swallow of the New World and the sand martin of the Old World are the same species: Riparia riparia.
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Tips for Easy Bird Identification
Identifying birds is at the very heart of bird watching. Each bird encountered is like a little puzzle or mystery to solve, because, while birds of a single species all share a certain set of physical traits, no two individual birds, like no two individual humans, are exactly alike.