Do Bull elephant seals eat other seals?

Some seals arecannibalistic...

Yes. Although seals mostly prey on fish and small mammals , many species of seal, such as the leopard seal, have been known to eat other seals as part of their diet.

There have been National Geographic films about how seals will eat other seals. Mostly the males will try to eat the young of other males; this is due to territorial claims of the female rather than hunger.