Fauna terrestrial: It is represented for the guanaco, choique, mara, zorro gris and martineta.

Marine Avifauna: Valdés Peninsula is one of the Patagonian coastal main places, in connection with the diversity and abundance of marine fauna. Some of the species that live there or use it as a resting and feeding place are: gulls, small gulls, cormorants, Antarctic dove, bigua, white heron, witch heron, oystercatchers, vapor duck, etc.

The most important species of the province are:

Marine elephants: The females measure about three meters and they weigh less than a ton, while the males can end up reaching seven meters with three thousand kilos weight. Another difference between sexes is that the males have a great nose, denominated prosboscide. This nose fills out when the animal is irritated, especially in rut periods. The females on the other hand, have a small muzzle. The mating begins in July, when the males arrive at the coast. The females give birth to a single puppy that measures between a meter and a meter and a half, with a weight of forty kilograms. During the rut, the males dispute the forty females harem's primacy. They show their force with gigantic, theatrical and spectacular fights.

Orcs: They are mammals that belong to the cetaceans order, but contrary to the whales they have teeth. They are characterized by their black color, except the stomach, and they have a remarkable dorsal flipper. Their longitude varies between 8 and 9,5 meters, weighing, the males nine tons and the females around five tons. The orc is a carnivorous animal that feeds of wolves and marine elephants, penguins, cormorants, dolphins and fish. Due to their conical teeth structure, they don't bite their preys, but rather they swallow them. The orcs don't have natural predators.

Southern Franca whale: They are cetaceans of the suborden of the mysticetos (whales with beards). Annually about 600 animals meet in Golfo Nuevo and San José. The mature ones have an approximate longitude from 12 to 16 meters and their weight oscillates among fifty tons. They have a breeding every three years it measures when it is born between 4 and 5 meters, with a weight of 3 tons. The gestation lasts twelve months and the calf is breastfeeded during fourteen months.

Magallanes' Penguin: They arrive at the Patagonian coasts to nest. they incubate the eggs and when the pigeons are born they are feed with fishes and squids to prepare them for the sea life.

Marine wolves of a hair: They belong to the otáridos family. They have a conical body that reaches three meters length in the males and two meters and a half in the females. The male has a wide neck with manes, strong head and short muzzle. Their ferocious denture, that has developed eyeteeth and molars, stands out. Their members make it difficult for them to move on land, but they are effective swimmers. They are very sociable, they allow people and crafts to come closer to them. Fishes are their exclusive food. When spring is coming they begin meeting at the "loberías", where the males fight ferociously to define the territory that they will occupy with their harem. The female gives birth to a single wolf a time, she enters in heat at once and she is copulated again.