New Jersey designated the American Goldfinch (Carduelis tristis) as the official state bird in 1935. Also called a wild canary, the goldfinch eats mainly seeds from dandelions, sunflowers, ragweed, and evening primrose.

The male goldfinch has a bright yellow body with black wings and tail, and black on top of his head. The female's plumage is more muted with an olive-yellow body and dark brown tail and wings (the male goldfinch also displays this same dull plumage in the winter months).

Source:

American goldfinch photos © Richard Mousel & Brian Jorg /
CritterZone: Animal - Wildlife - Nature Stock Photography
Copyrighted image - no use allowed without a license
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Links:

State Birds - 50 states List
National Bird