Originally Posted by djb

I thought they were always solitary types, but who knows, perhaps teenage siblings? I'll ask my resident bird experts one of these days.
Didn't witness this myself, but a trusted person once told me of witnessing a bird of prey swooping down on either a small dog our cat, leashed to a dock post, took off with the poor pet in its talons, leash pulled tight, it kept pulling until the leash either broke or slipped, and the horrified owner saw their pet carried off screaming...

poor thing, so a heron or other water bird would be fair game also I guess.