There are records of Otaria byronia inhabiting the Galapagos and Falkland Islands. Otaria byronia , also known as South American sea lions or maned seals, are the most sexually dimorphic of the five known sea lion species.
Males are approximately three times the size of females.
Adult males range from 2 to 2.5 meters in height and can weigh from 200 to 350 kilograms. The coat is dark brown on the dorsal side and dark yellow to gold on the ventral side. Males are distinguishable by their full mane, which is a paler color than the coat and by their larger, more muscled necks. A male's posture is usually upright with the rostrum turned upward. Adult females are much smaller in size and weight.