Praying Manatee

                      And you think YOUR underwater lawn has a bug problem.

Now, I really think a praying manatee would be a superb survivalist. It can store food in its large fat reserves, retreat into the ocean or go on land, depending on predation and habitat, eat grass, and also catch other creatures for food with its large grasping claws. Maybe you could domesticate them and milk them! Also, if it laid egg-sacs like a mantis, it could reproduce at a rate faster than any other mammal. Herds of praying manatees would roam both land and sea!

I bet they'd be delicious.