Did you know sea otters can be trained? Well they can, and this pup at the Point Defiance Zoo & Aquarium in Tacoma, Washington has quite the trick up her furry sleeve.

Nellie the sea otter can stack cups. And, as you can see above, her enthusiasm for the task is undeniably adorable. Her buddy Abra is pretty cute too, even though all she does is bat around in the shallow water.

Aren't you suddenly overwhelmed with the desire for a pet otter? They not only make you say "awww," they can also help out around the kitchen! However, you'd probably have to sacrifice your bathtub for their habitat. Perhaps that's why the whole aquatic mammal-thing hasn't caught on with the pet buying public yet...