Rock Ptarmigan

Rock Ptarmigan
Diet: Birch, buds, seeds, leaves, flowers, insects, berries
Appearance: Grey, white, or black feathers
Weight: 15-20 ounces
Length: 13-14 inches
Habitat: Tundra of Canada, Greenland, Eurasia, Asia
Enemies: Hawks, foxes, owls
Life Span: 4 or more years
The Rock Ptarmigan is also known as the Partridge or Snow Chicken. These birds camouflage from predators, changing their feathers season by season.

Hippopotamus

Hippopotamus
Diet: Grass
Appearance: Grey, pink
Weight: 2,900-7,900 pounds
Length: 10.8-16.5 feet
Habitat: Mostly Southern Africa
Enemies: Mainly man
Life Span: 40-50 years
Hippopotamus is Greek for "river horse". They are the 3rd largest mammal. A large group of these animals are called a pod, herd, or bloat. They can consume 150 pounds of grass a night.

Sea Otter

Sea Otter
Diet: Fish, sea urchins, mollusks, crustaceans
Appearance: Brown, grey, black (ish)
Weight: 31-99 pounds
Length: 3 feet 10 inches-4 feet 10 inches
Habitat: North Pacific Ocean
Enemies: Great white sharks, humans, bald eagles
Life Span: Up to 23 years
Sea otters have 32 teeth and can hold their breath up to 5 minutes.

Common Dolphin

Common Dolphin
Diet: Squid, fish
Appearance: Grey, white, yellow, tan
Weight: 180-520 pounds
Length: 6.2-8.2 feet
Habitat: Tropical, warm, temperate waters
Enemies: Sharks, orcas
Life Span: 25 years
There are two types of common dolphins: long-beaked and short-beaked.