Silver Fox
It has a long and thick tail more than a meter long (including the tail) and weighs between 8 and 13 kg. The high commercial prices of its fur, and its natural curiosity, have made of this fox an easy prey for man. The species is currently protected.

Rabbit or Hare
Probably introduced in Tierra del Fuego when the first Europeans arrived, the rabbit has spread rapidly. It lives mainly in open areas, where the availability of short grass has favored its stunning demographic growth. Their caves are interconnected and they have social habits, gathering in small groups during the breeding, which coincides with the season when grass grows.

Rata Almizclera
Introduced in Tierra del Fuego from Canada, this rodent has adapted and spread in an amazing way. It has short, smooth, thick hair, of shiny dark brownish-gray color, with a flaky and thick tail. This species is typical of swamps with aquatic vegetation, but it can also live on the banks of rivers and lakes, and in lower scale, at the seaside. It builds its warren digging and adding vegetation that grows near the water and it feeds on vegetation, mainly aquatic plants, tree barks and shrubs that grow in is surroundings.

Beaver
It was introduced from Canada in 1946 with the purpose of marketing its fur. It has a semi-aquatic life and it is noted for its skill to build complex warrens and dams. It is a big animal: the average weight for an adult specimen is 16 kg.

Southern Sealion
These sea mammals pertain to the eared sea family and they are different from the elephant seals in that they move using their fore limbs. The young males are gray and, as they grow older, they get a darker color and their characteristic hair grows and turns abundant.

They can weigh 300 kg and grow to 2 to 3 m high. Females are gray or light yellow; this color changes to dark yellow when they get older. They weigh around 160 kg and 1 to 1.5 m long. Although in the mating period they gather in very large colonies, during the sexual rest period they make winter colonies, not far from their summer destination. The breeding season starts in December, when the big males, called "sultans", arrive to the beaches waiting for the females to get there in order to form their harems.

Birds
From the 198 bird species known in Tierra del Fuego, grouped in 44 families, 116 are migratory residents and build their nests), 31 are regular residents: (summer, winter and annual), 7 are of indeterminate seasonal distribution and 2 appear as extinct. From the first two groups, nest- building species and Regular Visitors are the ones considered for the region and they add up to 147 species.

Chinstrap Penguin
A sea non-flying bird, it has a strong body, compact and waterproof plumage, wings turned into rigid flippers and webbed legs in a very back position. It boasts of black-bluish feathers on the back and white on the belly. It has a white face with a black line crossing the throat, like a mask, a black beak and pinkie legs. It stays on land for long periods of time but only during breeding and shedding seasons. It builds the nest in colonies and lays only 1 or 2 eggs.

Southern Fulmar
When flying over the coast it can be taken by mistake for a Kelp Gull because of its profile and way of flying. It is unlike all other petrels because of its pale plumage and semicircular gliding while in the open sea. It is pearled gray on the belly, has a pinkish beak with a black tip and a bluish nasal tube. In winter, large numbers of them often get into Ushuaia Bay coming through the Beagle Channel.

Blue-eyed Cormorant
In summer and fall it may show a white patch on the back, in contrast with the bluish back. The throat, cheeks and ventral part are covered in white. Its brown beak shows a yellow caruncula over the base; it has a bare brownish face and a dash of blue around the eye. Its legs are pinkish. Its truncated-cone shaped nest is built with seaweed, mud and its own excrements.

Ashy-headed Goose
These South American geese, both male and female, have a similar appearance. The head and the neck are gray while the chest and the back are reddish brown. It has a black tail and a white belly, black beak, orange legs. It feeds on grass and seaweed.

Steamer Duck
Strong and unable to fly, it often moves forward quickly, kicking and keeping its balance with flapping wings. Excellent diver can feed only on crustaceans and mollusks. It is steel gray, with a white ventral part. It has an orange beak with a black tip and yellow legs. Male and female are very slightly different. The male has a pale head with post-ocular lines. The female boasts a dark head and neck with bronzed cheeks. Its short wings not even reach the tail.

Rufous-tailed Hawk
It has a brown-blackish back and ochre belly, a wide and red tail with nine black and thin bands and a white end. It is a proficient hunter of small rodents and rabbits.

Peregrine Falcon
It flies fast and in straight line. It is an exclusive bird hunter. It is dark gray on the back, ocher-whitish on the ventral area, with black bars and spots. It has a black moustache and crown that contrasts with the white throat. It has a blackish tail.

Kelp Gull
It is white with a black back. The wings are black on the back, with a white border and they are white internally with black spots that end in a gray band under the wing. It has a yellow beak with a red spot on the lower jaw. The legs are also yellow.

Short-eared Owl
Of diurnal habits, it is usually seen alone, alert, ready to hunt, with its typical low flying and smoothly flapping its wings. The back is dark brown gray, with black and ocher spots. The belly is ochre with some brown parts. It has little yellow eyes and a black beak that makes contrast with the white face.