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(Top) Phalanges proportions for digit IV in birds fall roughly within a triangular plane in 3D morphospace. (Middle) Chick (white dots) and Zebra Finch (black dots) individuals fall within the same morphospace plane as proportion variations among species. (Bottom) Galapagos finch species that are more arboreal (yellow) have altered proportions as compared with more ground-dwelling species (black). Ellipses are centroid + 1 SD.
