Mammal, backbone (spinal column); hair or fur, whale, human, Fish, backbone (spinal column); gills, trout, goldfish, Amphibian, backbone (spinal column); smooth, slimy skin; lungs, frog, salamander, Bird, backbone (spinal column); feathers, hawk, robin, Reptile, backbone; rough, scaly skin; lays eggs, lizard, alligator.

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