The elephant has the heaviest skull of any terrestrial animal, with a mass of up to 228.5 kg. The skull is large and domed, with thick bony plates and ridges to support the massive tusks, trunk, and muscles. The skull also has large sinuses that reduce the weight and provide thermal regulation.
The giraffe has the third heaviest skull of any terrestrial animal, with a mass of up to 120 kg. The skull is long and narrow, with prominent horns and ossicones that are used for fighting and display. The skull also has a large braincase and a flexible neck that allow the animal to reach high foliage.
The saltwater crocodile has the largest skull of any living reptile, with a length of up to 1.5 m and a mass of up to 70 kg. The skull is broad and flat, with a powerful bite force and sharp teeth that can crush bones and shells. The skull also has a nictitating membrane and a valve that seal the eyes and nostrils when submerged.