Well they're different species of finch/passerine/bird, and in the order you've got them in they go from smallest to largest. Goldfinches normally eat teasel seeds, and chaffinches and bullfinches eat larger seeds.
The ulna is one of the bones in the wing of a chaffinch, located on the inner side of the wing between the elbow and the wrist. It helps to support the wing structure for flight and movement.
The male is a bright yellow in spring and summer, with a black cap, wings, and tail. The female is a dull olive green bird, with blackish wings and tail. In winter the male moult makes him resemble his mate, and he will regain his summer colors in the spring moult.
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