Pinniped
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Pinnipeds, better known as seals, are a clade of semi-aquatic marine mammals comprising 34 species. They include the walrus (the only extant odobenid), eared seals, and earless seals.
Seals are expected to have some presence in Wikathlon spheres, given its history with the original Wiki Camp 2 (which it has no affiliation with), and the fact that there is literally a seal spam on the Discord. But I don't expect it to have that much presence here compared to the latter.