Hutton's Vireo is a small songbird. It is dull olive-gray above and below. It has a faint white eye ring and faint white wing bars. It closely resembles a Ruby-crowned Kinglet, but has a thicker bill and is slightly larger in size. This vireo makes a hanging cup nest suspended from a fork of a tree.
Fun Fact The species name huttoni was given in 1851 by John Cassin, Philadelphia ornithologist, for William Hutton, a field collector of birds, about whom little is known.