WTF Fun Fact – Gouldian Finch Papillae

Gouldian finch chicks have blue opalescent beads on the corners of their mouths, called papillae, which make it easier for their parents to feed them in the dark. – WTF Fun Facts

Source: http://blog.cincinnatizoo.org/2014/01/28/why-are-there-spots-in-these-birds-mouths/

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