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
Black bear cub in a tree. Mother bears will often send their cubs up into the safety of a tree if larger bears (who might seek to injure the cubs) are nearby. Black bears have sharp claws and, in spite of their size, are expert tree climbers.
Species: American black bear, Ursus americanus
Location: Orr, Minnesota
Image ID: 18746
Axolotl. Axolotls are neotenic, which means they attain reproductive maturity while still in their larval form. Axolotls are extremely endangered in the wild and protected by law.
Species: Axolotl, Ambystoma mexicanum
Image ID: 13983
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
California sea cucumber. Sea cucumbers are related to sea stars and sea urchins. The sharp looking spines are soft to the touch and disappear into the skin when disturbed. If this visual defense doesnt work, the sea cucumber will expel its respiratory system. When this occurs in the wild it can regrow the lost organs.
Species: California sea cucumber, Parastichopus californicus
Image ID: 13732
California sea cucumber. Sea cucumbers are related to sea stars and sea urchins. The sharp looking spines are soft to the touch and disappear into the skin when disturbed. If this visual defense doesnt work, the sea cucumber will expel its respiratory system. When this occurs in the wild it can regrow the lost organs.
Species: California sea cucumber, Parastichopus californicus
Image ID: 13733
Red-bellied piranha. The piranhas teeth are so sharp that Amazonian Indians use them as knives. Each tooth has sawlike edges that allow the fish to slice through prey. The teeth are continually replaced throughout the piranhas life. Piranhas are illegal to import, sell or own in California.
Species: Red piranha, Pygocentrus nattereri
Image ID: 13956
Red-bellied piranha. The piranhas teeth are so sharp that Amazonian Indians use them as knives. Each tooth has sawlike edges that allow the fish to slice through prey. The teeth are continually replaced throughout the piranhas life. Piranhas are illegal to import, sell or own in California.
Species: Red piranha, Pygocentrus nattereri
Image ID: 13957
Red-bellied piranha. The piranhas teeth are so sharp that Amazonian Indians use them as knives. Each tooth has sawlike edges that allow the fish to slice through prey. The teeth are continually replaced throughout the piranhas life. Piranhas are illegal to import, sell or own in California.
Species: Red piranha, Pygocentrus nattereri
Image ID: 13958
Red-bellied piranha. The piranhas teeth are so sharp that Amazonian Indians use them as knives. Each tooth has sawlike edges that allow the fish to slice through prey. The teeth are continually replaced throughout the piranhas life. Piranhas are illegal to import, sell or own in California.
Species: Red piranha, Pygocentrus nattereri
Image ID: 13959
Red-bellied piranha. The piranhas teeth are so sharp that Amazonian Indians use them as knives. Each tooth has sawlike edges that allow the fish to slice through prey. The teeth are continually replaced throughout the piranhas life. Piranhas are illegal to import, sell or own in California.
Species: Red piranha, Pygocentrus nattereri
Image ID: 13960
Red-bellied piranha. The piranhas teeth are so sharp that Amazonian Indians use them as knives. Each tooth has sawlike edges that allow the fish to slice through prey. The teeth are continually replaced throughout the piranhas life. Piranhas are illegal to import, sell or own in California.
Species: Red piranha, Pygocentrus nattereri
Image ID: 13961
Red-bellied piranha. The piranhas teeth are so sharp that Amazonian Indians use them as knives. Each tooth has sawlike edges that allow the fish to slice through prey. The teeth are continually replaced throughout the piranhas life. Piranhas are illegal to import, sell or own in California.
Species: Red piranha, Pygocentrus nattereri
Image ID: 13962
Lesser siren, a large amphibian with external gills, can also obtain oxygen by gulping air into its lungs, an adaptation that allows it to survive periods of drought. It is native to the southeastern United States.
Species: Lesser siren, Siren intermedia
Image ID: 13980
Lesser siren, a large amphibian with external gills, can also obtain oxygen by gulping air into its lungs, an adaptation that allows it to survive periods of drought. It is native to the southeastern United States.
Species: Lesser siren, Siren intermedia
Image ID: 13981
Axolotl. Axolotls are neotenic, which means they attain reproductive maturity while still in their larval form. Axolotls are extremely endangered in the wild and protected by law.
Species: Axolotl, Ambystoma mexicanum
Image ID: 13982
Black bear cub in a tree. Mother bears will often send their cubs up into the safety of a tree if larger bears (who might seek to injure the cubs) are nearby. Black bears have sharp claws and, in spite of their size, are expert tree climbers.
Species: American black bear, Ursus americanus
Location: Orr, Minnesota
Image ID: 18850
Black bear cub in a tree. Mother bears will often send their cubs up into the safety of a tree if larger bears (who might seek to injure the cubs) are nearby. Black bears have sharp claws and, in spite of their size, are expert tree climbers.
Species: American black bear, Ursus americanus
Location: Orr, Minnesota
Image ID: 18858
Black bear cub in a tree. Mother bears will often send their cubs up into the safety of a tree if larger bears (who might seek to injure the cubs) are nearby. Black bears have sharp claws and, in spite of their size, are expert tree climbers.
Species: American black bear, Ursus americanus
Location: Orr, Minnesota
Image ID: 18868
Black bear cub in a tree. Mother bears will often send their cubs up into the safety of a tree if larger bears (who might seek to injure the cubs) are nearby. Black bears have sharp claws and, in spite of their size, are expert tree climbers.
Species: American black bear, Ursus americanus
Location: Orr, Minnesota
Image ID: 18891
Black bear cub in a tree. Mother bears will often send their cubs up into the safety of a tree if larger bears (who might seek to injure the cubs) are nearby. Black bears have sharp claws and, in spite of their size, are expert tree climbers.
Species: American black bear, Ursus americanus
Location: Orr, Minnesota
Image ID: 18956