a) About 12
b) About 20
c) About 45
d) More than 60
Answer: c) About 45 tern species exist worldwide.
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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.