Dall sheep, absolutely. They’re the only species in the game I wasn’t at all familiar with prior to playing, and they’ve come to be one of my top favorites. They’re so much fun to watch, and they allow for habitat builds that no other animal does.
I suppose the grizzly also counts. I’ve always been relatively “whatever” towards your black and brown bears, but being able to build habitats with local trees and swimming creeks does it for me like nothing else. They’re definitely going to end up sharing that crown once the new DLC drops, though.
Also: capuchins. They’re the sole representative of such a common zoo niche, which means they get used EVERYWHERE.
And I guess the ugly otters, because at the end of the day they’re still otters.