Swimming Sauceback

The swimming sauceback's hooves have been elongated, so that they can swim. They have gained a little sac under their stomach that can be filled with air. That way, their center of gravity doesn't lie in front, where their lungs are, but slightly lower, giving him more stability in water. His tail also has split in two, forming a fluke. This way he can hunt more effectively by camouflaging himself in the water by pumping less air in the sac and thus being low in the water, so that he can sneak up on his prey, plapirs. They are also the reason why he has changed colors.

To grab hold of the plapirs more easily, they've grown strong curved inwards tusks, with some spikes on them. That way, the plapir gets killed almost instantly and the swimming sauceback can easily drag it to the shore. But due to their now elongated hooves, the saucebacks themselves have grown smaller, to get to the prey more easily.