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.
A goldfinch typically has 2 to 6 eggs per clutch when breeding. They can raise 2 to 3 broods in a single breeding season, depending on environmental conditions and food availability. This means a goldfinch can potentially have between 4 to 18 babies in a season. However, the actual number may vary based on factors such as predation and nesting success.
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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A goldfinch is a small songbird, typically measuring about 4.5 to 5.5 inches in length and having a wingspan of approximately 7.5 to 9.8 inches. They usually weigh between 0.4 to 0.5 ounces. Their size and vibrant coloration make them easily recognizable among other small birds.
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