No contest. Orcas are bigger, smarter, and work in teams.
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There are some great YouTube videos of killer whales trying to flip a seal off of a small ice flow. You can tell they’re working things out.
I’ve seen some of those two. I think they are playing with them like a cat does sometimes. Amazing to watch. Although I did start to feel sorry for the seal!
I don’t think Orcas kill too many humans. Although that is probably because they are swimming off the coast of Alaska and Canada, and not off California as much.