Iowa State Bird Eastern Goldfinch TeeThe Eastern Goldfinch is one of the latest nesters in North America, deliberately waiting until midsummer when thistle and milkweed fibers are available it lines its nest so tightly the cup can actually hold water. Iowa's state bird also molts into that vivid breeding yellow later than you'd expect, so the male arriving at your feeder in April still looks like he's getting dressed. Across Iowa's prairies and roadsides, Goldfinches work the wild