The bisons massive head is its most characteristic feature. Its forehead bulges because of its convex-shaped frontal bone. Its shoulder hump, dwindling bowlike to the haunches, is supported by unusually long spinal vertebrae. Over powerful neck and shoulder muscles grows a great shaggy coat of curly brown fur, and over the head, like an immense hood, grows a shock of black hair. Its forequarters are higher and much heavier than its haunches. A mature bull stands about 6 1/2 feet (2 meters) at the shoulder and weighs more than 2,000 pounds (900 kilograms). The bisons horns are short and black. In the male they are thick at the base and taper abruptly to sharp points as they curve outward and upward; the females horns are more slender.
Species: American bison, Bison bison
Location: Yellowstone National Park, Wyoming
Image ID: 13120
The South Georgia Pintail duck, also known as the South Georgian Teal, is endemic to South Georgia Island and is a vagrant to the South Sandwich Islands. The South Georgia Pintail feeds on a variety of marine and freshwater vegetation, including algae, as well as upon invertebrates.
Species: South georgia pintail, Anas georgica georgica
Location: Grytviken, South Georgia Island
Image ID: 24462
The bisons massive head is its most characteristic feature. Its forehead bulges because of its convex-shaped frontal bone. Its shoulder hump, dwindling bowlike to the haunches, is supported by unusually long spinal vertebrae. Over powerful neck and shoulder muscles grows a great shaggy coat of curly brown fur, and over the head, like an immense hood, grows a shock of black hair. Its forequarters are higher and much heavier than its haunches. A mature bull stands about 6 1/2 feet (2 meters) at the shoulder and weighs more than 2,000 pounds (900 kilograms). The bisons horns are short and black. In the male they are thick at the base and taper abruptly to sharp points as they curve outward and upward; the females horns are more slender.
Species: American bison, Bison bison
Location: Yellowstone National Park, Wyoming
Image ID: 13134
Hermit crab. Hermit crabs wear shells to protect their soft abdomens, which are asymmetrical and curved to fit the spiral shape of their shell. Like all crabs, hermit crabs are decapods; they have five pairs of legs, including a pair of claws. One claw is much larger than the other, the hermit crab uses it for defense and food shredding while it uses the smaller claw for eating. The second and third pairs of legs help the crab walk, and the last two pairs hold the hermit crab in its shell.
Species: Hermit crab, Pagurus
Image ID: 13693