Rare Yellow-rumped Audubon’s Warbler?

This strange yellow-rumped warbler came to eat peanut butter this morning. It was silver, it had the normal yellow-rumped warbler markings, but no yellow rump! Is this an Audubon’s subspecies, a Mytrle x Audubon’s hybrid, or just a normal myrtle yellow rump? Any ideas?

Yellow-rump on lawn chair

Yellow-rumped Warblers

I was sitting outside today watching the birds. There were probably about 50 yellow rumps foraging and eating mosquito hawks in the grass. They come every day and eat peanut butter

Backyard Birds part 2

The Yellow-rumped Warbler comes every day, multiple times a day, for peanut butter.

Warbler

Warbler photos

Feeder Birds

The Cardinals visit sometimes, the Chipping Sparrows visit in flocks of about 50 every day, the Yellow-rumped WArbler visits multiple time a day to eat suet, and The Peep visits every day.

Female Yellow-rumped Warbler, Chipping Sparrow, Mourning Doves, The Peep, Eastern Phoebe

Today was a great day for birding! We saw a new lifer: Brown Creeper. We also saw a Brown-headed Nuthatch, a female Yellow-rumped Warbler, a Pine Warbler, and more! Also, yesterday I saw 5 Purple Finches in a tree! (New lifer!)