Colorful visitors

Not long ago we noticed some unusually bright visitors in our yard -- a pair of Audubon's warblers.  We've never seen these birds in the yard before in the six years we've lived here.

Today there were dozens of these birds flitting around the plum tree.  In fact, it looks like we may have two kinds of yellow-rumped warblers -- Audubon's and the Myrtle warblers or an intergrade of the two.

Here's the female Audubon's.

And the male -- probably a Myrtle x Audubon's.