(I) Humans have a long history of studying, appreciating, and using animal diversity, but classifying a new animal isn't always easy. (II) Imagine you were the first European zoologist to encounter a strange animal in Australia that has the following physical features. (III) It has a bill and webbed feet similar to a duck's, but the rest of its furry body looks very much like that of a muskrat or other aquatic rodent, and it lays eggs. (IV) Unlike the rest of the world, Australia has relatively few placental mammals. (V) How would you classify it?