I'm almost certainly overthinking the bird on the right (the subject of the observation), but a couple traits point in the general direction of Neotropic, sort of? I'm pretty sure it's "just" a slightly unusual Double-crested, but I'm also not confident enough to make the call either way.
26 Aug 2023.
Jackson Pond Preserve, Bucks Co, PA.
Merlin app is repeatedly reporting Rufous hummingbirds here this morning. This is the first one I've been able to spot that looks like it could possibly be one, maybe a female? Still watching :-)