Why are mammals superior to other forms of life?

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>While leopard seals are apex predators who have been known to feast on penguins and other seals, this is the first time researchers have found evidence that sharks are also on the menu.
>The researchers, from groups, institutes and universities throughout New Zealand and Australia, sorted through more than 100 leopard seal poos to compile the evidence.
https://www.stuff.co.nz/environment/300480610/new-zealand-leopard-seals-discovered-eating-sharks-for-the-first-time