So what your being asked is, "This animal has short legs and its hut is large. Lives near the rivers and bathes in the river." I'm thinking that the animal is probably a Hippo because they have short legs and live under water, but turtles have a large hut(their shell on their back) as well as short legs and live in the water. I'm kind of leaning more towards a turtle being your answer. So what you would write in Spanish is "Tortuga" which means turtle/tortoise. Hope this helps!
