OK so first I would like to say that seals should not run towards the orca when attacked. but I understand if that is too hard to do.
But however, When I make a roof over my seals orcas still can attack through it. I come back from an adventure to find that an orca had killed all my seals. (they had nametags so they did not despawn). I feel it is highly biased towards the orcas and it saddens me that the seals have next to no chance. Also, maybe add pod types? not all killer whales eat seals...