Aggression
This ruby-crowned kinglet literally jumped on the Tennessee warbler in the pond. It may have been territorial or perhaps a misguided attempt to breed. Either way the Tennessee wasn't amused. I've not seen behaviour like this before. The more you watch the more you see. Tennessee warbler -Oreothlypis peregrina Ruby-crowned kinglet -Regulus calendula There is a yellow rumped warbler in the foreground.