'Mega' Morph of Black-Bellied Seedcrackers (<i>Pyrenestes ostrinus</i>) (IMAGE)

Princeton University

'Mega' Morph of Black-Bellied Seedcrackers (<i>Pyrenestes ostrinus</i>)

Caption

Princeton biologist Bridgett vonHoldt discovered that the 'mega' morph of the black-bellied seedcrackers (Pyrenestes ostrinus), a Cameroonian finch, appears to result from an additional evolutionary step after the evolution of the large- and small-beaked morphs.

Credit

Dr. Tom Smith, UCLA

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