[Dobbs]

Orcas are dolphins. Do you mean bottle nose dolphins?

[hidden80]

I think so. You just reminded me that orcas are dolphins, but I'm more curious about the potentially devastating effect of a blue whale exhibiting this sort of "aggression".

[z3phyr]

Blue whales are usually loners and thus not capable of planning and inflicting damage like a pack of sea wolves.

Blue whales are usually also very calm and do not have teeth (They can still be aggressive in defending themselves or their calves against orcas, who do sometimes hunt Blue whales)

[bmitc]

Orcas are both dolphins and whales. I think it's pretty clear that the commenter meant other dolphins and whales.