Adult Mediterranean monk seals can be any color from dark brown or black to light grey. They are usually light gray along the belly. Pups have a black woolly coat and a white or yellow patch on the belly. They molt at about 4-6 weeks and their black woolly coat is replaced by a silvery gray coat that can darken over time.
Adult males are on average about 2.4m in length and females are slightly shorter. Males weigh about 315 kg and females weigh about 300 kg.
Average mass: 300-315 kg.
Average length: 2.4 m.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: male larger
Average mass: 275000 g.