I love reading nature articles like this and learning more about wild animals, so these leopard seals live a pretty good life if they're not hunted like other wild animals so they're essentially the top of the food chain in this environment. That's if humans don't come and ruin it for them.
Random fact: They use to be hunted in the old sealing days about 100 years ago. The main use of the seal was to make dog food. They stopped hunting them not long after they started.