Under these drastically changing conditions, the struggle to survive favored the larger birds with deep, strong beaks for opening the hard seeds. Smaller finches with less-powerful beaks perished.

“normal” beaks (examples shown of a petrel and a gull) and a bird with a tactile bill-tip organ (a tinamou, close relative of ostriches and emus and which has an ancestral bill-tip organ ...

And what influences a bird’s vocal range, and the kinds of sounds it can make? Beak size? Body size ... Give us the bird’s eye view. ZUZANA BURIVALOVA: The bird’s eye view, yes– so Sagar found a lot ...