Quote Originally Posted by Shaggy Hiker View Post
So, what's the point of all this? It appears that you have concluded that there isn't a single pyramid with a single creature occupying the top spot, which would be correct, but why bother even considering it?
Don't forget the sea birds: sea eagles, osprey (sea hawk), colonies of coastal falcons, in fact any sea bird with a beak strong enough to pierce sea mammal skin can also potentially get an easy mouthful of flesh every time they get to the surface to breath. Same goes for sea reptiles. Moreover although some can dive to great depths to hunt small fish I don't think they present much of a threat to sharks.

Sea birds might put sea mammals even further down the food chain.

Now that I have the main contenders, at least I hope I have the main contenders, I can now try and create some sort of hierarchy out of them and try to determine the top predator.