it is important that they have enough fish to eat
it is a community not an ecosystem . they are part of ecosystem
They have a family.
sea lions
Maroo's family from "Maroo of the Winter Caves" call the seals they see "eskimos."
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a church community
Yes. But im not sure whether or not they have to serve for the navy before the SEALs. They can work with us, but only navy people are navy seals, hence the name.
We call baby seals pups.
Community stability
A neighborhood.
community
There are a lot of collective nouns for seals. You might call a group of seals a "rookery," or a "harem," or maybe a "herd," or a "pod," or simply a "bob."