Most baby birds are adorable little floofs — but not all of them. The tongue and palate of estrildid finch chicks are strangely spotted and ringed. They display these markings while they beg for food. Most species’ chicks have mouth markings in colors ranging from black or white to bright yellow, orange, red or blue. The function of these markings has long puzzled scientists.

More info and transcript at BirdNote.org. 

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