Tiny bird feeding great big bird at feeder
At my feeder today I noticed one of my tinniest of birds, possibly a male ruby-crowned kinglet, because he has a little reddish hat on, and this much larger, clumsy, vaguely sparrow-marked bird was coming after him on the triple-tube bird feeder. I thought he was trying to scare the little bird away, but no, he opened his mouth and the tiny bird proceeded to stuff bird seed in, as if he was the parent bird.
Is this a case where some bird has come along and pushed eggs out of a nest and put her own eggs in their place, so that this tiny bird has had to raise this monstrosity?
And what kind of birds do this? I can't remember.