Given those three creatures, it’s a tough call. Some cats can jump so well you would think they do fly, and though they may hate to do it, they can swim if need be. And some fish are even called flying fish, as they can break the water’s surface at terrific speeds and use their fins to glide in the air. But the best of birds are incredibly adept at flying, ostriches run far faster than most creatures and manage it on just two legs, and penguins can swim with their wings faster than most fish. That’s how they stay so well fed. So I would have to give the nod to the birds.
But if you will indulge me in a bit of human chauvinism, there is only one creature that has learned, with the help of a few gadgets the creature devised, to run at nearly the speed of sound, swim faster than any fish, dive to the bottom of the Challenger Deep, and fly to the M,oon and beyond. IMHO, when it comes to MO, we humans hold all the trump cards.