The habitat of Pakicetus inachus and Dorudon atrox can be inferred from their skeletal structures. Pakicetus inachus had strong legs and feet, adapted for walking on land, and a long, narrow skull, adaptations for sensing its prey on land. On the other hand, Dorudon atrox had flippers and a dorsal fin, adaptations for swimming and maneuvering in water, and a large, barrel-shaped torso, adaptations for buoyancy control in water. These adaptations suggest that Pakicetus inachus lived on land and that Dorudon atrox lived in water.