the yellow-rumped Warbler’s nest contains 3 to 6 eggs. Polytypic (6 ssp.). Length 5.3". Spring male: crown and back blue-gray streaked with black. Yellow crown patch, distinct rump patch ...

Keep an eye on the birds and look for a yellow patch on the rump, which gives away their identification as yellow-rumped warblers ... Their brownish-gray winter plumage is hardly eye-catching ...