At first I thought eastern phoebe as they are very prevalent in South Florida in fall/winter, but then I noticed its belly is yellower than a phoebe's and it seems to have an eyering. No prominent wing bars, though. Help!
What flycatcher is this?
It is an Eastern Phoebe first-winter (structure and plumage pattern fit), but with exceptionally bright yellow underparts - a mutation called 'xanthochromism'. First-winter Eastern Phoebes usually have a hint of yellow in the same area, but only a hint, not full-on yellow like this. Very smart bird, though!