when did birds first appear on earth
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when did birds first appear on earth
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when did birds appear
what era did birds first appear
when did the first birds evolve
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when were birds discovered
when were birds created
first bird appeared in which era
when was early bird made
what was the earliest bird
when did birds first appear on earth, when was the first bird on earth, when did birds appear, what era did birds first appear, when did the first birds evolve, when did birds originate, when were birds discovered, when were birds created, first bird appeared in which era, when was early bird made, what was the earliest bird