Known as "eared seals" due to their external ear flaps (pinnae), these seals stand with the fore and hind limbs under the body, pointing forward. Extreme sexual dimorphism is evident in A. gazella, with the males weighing between 60 and 120 kg and the females weighing between 30 and 51 kg. Adult males are 1-2 m long, whereas the females vary between .5 and 1 m. The adults are covered in a dense velvety underpelt, which is both waterproof and windproof, and an outer layer of coarse grey-brown hair. The males can be distinguished from the females by their long mane of shoulder fur. At birth, pups weigh between 4.5 and 6.5 kg and measure a length of between 60 and 73 cm. The pups have black wooly fur, which is retained for 2-3 months. The pups then display a silver-grey coat which lasts until adulthood.
Range mass: 30 to 120 kg.
Average mass: 65 kg.
Other Physical Features: endothermic ; homoiothermic; bilateral symmetry
Sexual Dimorphism: male larger; ornamentation