from chines japanes
American goldfinch, European goldfinch, lesser goldfinch, evening grosbeak, pine siskin, Lawrence's goldfinch.
The European goldfinch weighs around 17 grams: http://blx1.bto.org/birdfacts/results/bob16530.htm
Iowa's State Bird is the American Goldfinch, Carduelis tristis, and may have been selected because of their similarity to the European goldfinch which the early immigrants were familiar with.
An Eastern Goldfinch
Closely related are the pine siskin, Carduelis pinus, and the European goldfinch, Carduelis carduelis. Other relatives are the purple finch, house finch, indigo bunting, painted bunting, lazuli bunting, various grosbeaks.
It is the willow goldfinch
Marcus Goldfinch is 6'.
Eastern Goldfinch (aka American Goldfinch)
Yes. The Willow Goldfinch is a subspecies found west of the Rocky Mountains in the US.
The scientific name of the Willow Goldfinch (aka American Goldfinch) is Carduelis tristis.
American Goldfinch was created in 1758.
Bill Goldfinch was born in 1916.