That's a pretty even split between mustelids and crustaceans.
For mustelids, especially weasels... beyond being one of the most precious things I've ever seen and just exploding with personality, they're actually bloodthirsty killing machines that are really good at it and incredibly smart. Beyond that, though? It's HOW they hunt (and why they play how they do.) That whole 'spaz out and lose their mind' thing? It's to disorient prey. They're nature's little drunken boxers, but completely unhinged and ruthless.
As for crustaceans... there's a lot of little things, but they've always just... clicked with me.
Loving shout out to dragonflies, pigs, and cats.