Forest & Wetlands

Brother-and-sister wolverines Rainier and Ahma were both born at Northwest Trek from different litters. Now they’re back home and together again, getting along famously in a newly-expanded habitat that includes plenty of trees to climb and boulders to explore.

And they’re great to watch. The largest land species in the weasel family, wolverines have evolved in harsh Northwest mountain areas to be tough survivors: agile climbers, strong diggers, and afraid of nothing.

Erethizon dorsatu

WHAT: Dark brown to almost black, with an upper body covered in barbed quills between guard hairs, and stiff bristles below. It has four clawed toes on the forefoot and five on the hind foot.
WHERE: Across North America.
SIZE: Length 2-3.5 ft.; height 1 foot; weight up to 33 lbs.
EATS: Plants and inner bark of trees.
BABIES: Breeding in late fall. After a 6-month pregnancy the female gives birth to one porcupette weighing 12-20 oz.
STATUS: Common.
FUN FACTS: When threatened, a porcupine protects itself by climbing or fleeing.
If cornered, it erects its quills, turns its rump toward the source of danger and rapidly lashes out with its tail. The quills are not thrown or shot but must come in contact with skin or other objects to detach.

Procyon lotor

WHAT: You can recognize a raccoon by its ringed tail and black facemask. Its grizzled coat varies in color depending on region.
WHERE: Southern Canada and most of the U.S.
SIZE: Length 3 ft. (including tail); height 9-10 in.; weight 15-18 lbs.
EATS: Anything they find or capture, especially aquatic animals.
BABIES: Breeding from January-February. After a 60-day pregnancy the female gives birth to 2-5 kits, weighing 2-4 oz.
STATUS: Common.
FUN FACTS: Raccoons are very curious animals, handling and investigating almost everything they discover.
Their extremely sensitive forepaws are their main tool for analyzing potential food, often from water. This dexterous manipulation can look a little like they are washing their food.
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Lontra canadensis

WHAT: River otters are members of the weasel family, adapted for water living. They have streamlined bodies, short legs with webbed hind feet and a smaller skull.
WHERE: Fresh and salt water that doesn’t freeze throughout North America.
SIZE: Length 3.5-4.5 ft. (including tail); height 7-9 in.; weight 15-20 lbs.
EATS: Fish, small mammals, birds, reptiles, amphibians, invertebrates.
BABIES: Breeding from June-July. After an 8-month pregnancy the female gives birth to 2-7 young, weighing less than ½ pound.
STATUS: Secure.
FUN FACTS: Otters are among the most playful of mammals: they chase, slide and play with objects.
Near den entrances, otters often twist tufts of grass together to use as scent stations to mark territory or attract mates.
Unlike other members of the weasel family, otters are sociable, living in family groups and sometimes traveling with another family.

Castor canadensis

WHAT: Beavers are large rodents, with blonde to black fur. They have small ears and eyes, and a long, horizontally flattened, paddle-shaped and scaly tail.
WHERE: Forested areas with fresh water across North America.
SIZE: Length 4 ft.; height up to 12 in.; weight 40-60 lbs.
EATS: Leaves, bark, stems and roots.
BABIES: Breeding from January-February. After a 3-month pregnancy, females give birth to 2-3 kits that weighs about one pound.
STATUS: Secure.
FUN FACTS: Beavers are communal animals that live in family groups. When kits reach 2 years old they are driven off.
They are active anytime, but usually nocturnal around humans. When alarmed a beaver will slap its tail on the surface of the water, creating a loud warning for others.
Beavers are engineers, second only to humans in their ability to alter their environment. They work together to construct elaborate dams and lodges to create ponds or wetlands.

Taxidea taxus

WHAT: A short-legged, heavy-bodied carnivore with a flattened
appearance and distinctive white stripe from nose to back.
WHERE: Dry, open country
SIZE: Length 2 –2.5 ft.; weight 15 to 20 lbs.
EATS: Small mammals, reptiles, birds, invertebrates and occasionally plants.
BABIES: Breeding June-July. After a 7-week pregnancy, females give birth to 2-7 young, which weigh less than ½ lb.
STATUS: Secure.
FUN FACTS: Badgers excavate. They dig to find prey, to escape danger, and to survive winter temperatures.
They’re known for solitary behavior and aggressiveness. When cornered badgers will snarl, expose their teeth, and sometimes snap their jaws together.
Although not true hibernators, they will den up during cold weather.

Martes americana

WHAT: Martens have the typical weasel shape and may be seen in a variety of colors ranging from silver-grey to burnt umber. A conspicuous throat patch also varies in size and color. Martens tend to be lighter colored on the head and darker on the body.
WHERE: Prefer higher altitudes in mature evergreen forests but may also be found in mixed forests.
SIZE: Length 20 to 30 inches long including tail; weight 2 to 4 pounds
EATS: The diet consists of small mammals, birds, reptiles, amphibians, invertebrates and some plants.
BABIES: The breeding season extends from July through August. The gestation period is about 9 months including delayed implantation. The female gives birth to 2 to 5 young. At birth, the newborn kit weighs about 1 ounce.
STATUS: Secure.
FUN FACTS: Although the marten is the most arboreal of the weasel family it actually spends most of its time on the ground. Any movement in the trees by potential prey will cause the marten to ascend quickly. They are active throughout winter and may travel 5 miles a day searching for food.