Csp

Solid bars show the known fossil record of a group. Dotted lines denote the possible evolutionary relationships between groups.

PALEOCENE PLIOCENE PLEISTOCENE

f EOCENE OUQOCENE MIOCENE ♦ ♦ RECENT

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DIA~ TRYM1DS

IV-TOOnillD BIRDS

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/ERS, PENGUINS AN!) 5HFAK.W

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