Search results for Mature

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Brown pelican immature plumage, likely second winter coloration approaching breeding plumage, on cliff over the ocean, Pelecanus occidentalis, Pelecanus occidentalis californicus, La Jolla, California
Brown pelican immature plumage, likely second winter coloration approaching breeding plumage, on cliff over the ocean.
Species: Brown Pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus
Location: La Jolla, California
Image ID: 38708  
Heermann's gull, immature, in flight, Larus heermanni, La Jolla, California
Heermann's gull, immature, in flight.
Species: Heermann's gull, Larus heermanni
Location: La Jolla, California
Image ID: 28991  
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest, Cervus canadensis roosevelti, Redwood National Park, California
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest.
Species: Roosevelt elk, Cervus canadensis roosevelti
Location: Redwood National Park, California
Image ID: 26389  
Male elk (bull) alongside female elk in grassy meadow, during rutting season. A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem, Cervus canadensis, Yellowstone National Park, Wyoming
Male elk (bull) alongside female elk in grassy meadow, during rutting season. A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem.
Species: Elk, Cervus canadensis
Location: Yellowstone National Park, Wyoming
Image ID: 19723  
Bull elk, with large antlers, alongside female elk during rutting season, autumn. A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem, Cervus canadensis, Yellowstone National Park, Wyoming
Bull elk, with large antlers, alongside female elk during rutting season, autumn. A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem.
Species: Elk, Cervus canadensis
Location: Yellowstone National Park, Wyoming
Image ID: 19724  
Bull elk, with large antlers, alongside female elk during rutting season, autumn. A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem, Cervus canadensis, Yellowstone National Park, Wyoming
Bull elk, with large antlers, alongside female elk during rutting season, autumn. A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem.
Species: Elk, Cervus canadensis
Location: Yellowstone National Park, Wyoming
Image ID: 19782  
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest, Cervus canadensis roosevelti, Redwood National Park, California
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest.
Species: Roosevelt elk, Cervus canadensis roosevelti
Location: Redwood National Park, California
Image ID: 25898  
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest, Cervus canadensis roosevelti, Redwood National Park, California
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest.
Species: Roosevelt elk, Cervus canadensis roosevelti
Location: Redwood National Park, California
Image ID: 25901  
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest, Cervus canadensis roosevelti, Redwood National Park, California
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest.
Species: Roosevelt elk, Cervus canadensis roosevelti
Location: Redwood National Park, California
Image ID: 25905  
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest, Cervus canadensis roosevelti, Redwood National Park, California
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest.
Species: Roosevelt elk, Cervus canadensis roosevelti
Location: Redwood National Park, California
Image ID: 25907  
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest, Cervus canadensis roosevelti, Redwood National Park, California
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest.
Species: Roosevelt elk, Cervus canadensis roosevelti
Location: Redwood National Park, California
Image ID: 25908  
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest, Cervus canadensis roosevelti, Redwood National Park, California
Roosevelt elk, adult bull male with large antlers. This bull elk has recently shed the velvet that covers its antlers. While an antler is growing, it is covered with highly vascular skin called velvet, which supplies oxygen and nutrients to the growing bone; once the antler has achieved its full size, the velvet is lost and the antler's bone dies. This dead bone structure is the mature antler, which is itself shed after each mating season. Roosevelt elk grow to 10' and 1300 lb, eating grasses, sedges and various berries, inhabiting the coastal rainforests of the Pacific Northwest.
Species: Roosevelt elk, Cervus canadensis roosevelti
Location: Redwood National Park, California
Image ID: 25909  
Bull elk, with large antlers, alongside female elk during rutting season, autumn. A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem, Cervus canadensis, Yellowstone National Park, Wyoming
Bull elk, with large antlers, alongside female elk during rutting season, autumn. A bull will defend his harem of 20 cows or more from competing bulls and predators. Only mature bulls have large harems and breeding success peaks at about eight years of age. Bulls between two to four years and over 11 years of age rarely have harems, and spend most of the rut on the periphery of larger harems. Young and old bulls that do acquire a harem hold it later in the breeding season than do bulls in their prime. A bull with a harem rarely feeds and he may lose up to 20 percent of his body weight while he is guarding the harem.
Species: Elk, Cervus canadensis
Location: Yellowstone National Park, Wyoming
Image ID: 19696  
Juvenile bald eagle, second year coloration plumage, immature coloration showing white speckling on feathers, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis, Kachemak Bay, Homer, Alaska
Juvenile bald eagle, second year coloration plumage, immature coloration showing white speckling on feathers.
Species: Bald eagle, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis
Location: Kachemak Bay, Homer, Alaska
Image ID: 22826  
Brown pelican immature plumage, likely second winter coloration approaching breeding plumage, on cliff over the ocean, Pelecanus occidentalis, Pelecanus occidentalis californicus, La Jolla, California
Brown pelican immature plumage, likely second winter coloration approaching breeding plumage, on cliff over the ocean.
Species: Brown Pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus
Location: La Jolla, California
Image ID: 38706  
Juvenile bald eagle, second year coloration plumage, closeup of head and shoulders, snowflakes visible on feathers. Immature coloration showing white speckling on feathers, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis, Kachemak Bay, Homer, Alaska
Juvenile bald eagle, second year coloration plumage, closeup of head and shoulders, snowflakes visible on feathers. Immature coloration showing white speckling on feathers.
Species: Bald eagle, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis
Location: Kachemak Bay, Homer, Alaska
Image ID: 22808  
Juvenile bald eagle, second year coloration plumage, closeup of head and shoulders, snowflakes visible on feathers. Immature coloration showing white speckling on feathers, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis, Kachemak Bay, Homer, Alaska
Juvenile bald eagle, second year coloration plumage, closeup of head and shoulders, snowflakes visible on feathers. Immature coloration showing white speckling on feathers.
Species: Bald eagle, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis
Location: Kachemak Bay, Homer, Alaska
Image ID: 22834  
Juvenile bald eagle, second year coloration plumage, immature coloration showing white speckling on feathers, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis, Kenai Peninsula, Alaska
Juvenile bald eagle, second year coloration plumage, immature coloration showing white speckling on feathers.
Species: Bald eagle, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis
Location: Kenai Peninsula, Alaska
Image ID: 22845  
Juvenile bald eagle, second year coloration plumage, immature coloration showing white speckling on feathers, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis, Kenai Peninsula, Alaska
Juvenile bald eagle, second year coloration plumage, immature coloration showing white speckling on feathers.
Species: Bald eagle, Haliaeetus leucocephalus, Haliaeetus leucocephalus washingtoniensis
Location: Kenai Peninsula, Alaska
Image ID: 22868  
House finch, immature, Carpodacus mexicanus, Amado, Arizona
House finch, immature.
Species: House finch, Carpodacus mexicanus
Location: Amado, Arizona
Image ID: 22901  
House finch, immature, Carpodacus mexicanus, Amado, Arizona
House finch, immature.
Species: House finch, Carpodacus mexicanus
Location: Amado, Arizona
Image ID: 22919  
House finch, immature, Carpodacus mexicanus, Amado, Arizona
House finch, immature.
Species: House finch, Carpodacus mexicanus
Location: Amado, Arizona
Image ID: 22926  
House finch, immature, Carpodacus mexicanus, Amado, Arizona
House finch, immature.
Species: House finch, Carpodacus mexicanus
Location: Amado, Arizona
Image ID: 22996  
House finch, immature, Carpodacus mexicanus, Amado, Arizona
House finch, immature.
Species: House finch, Carpodacus mexicanus
Location: Amado, Arizona
Image ID: 22997  
House finch, immature, Carpodacus mexicanus, Amado, Arizona
House finch, immature.
Species: House finch, Carpodacus mexicanus
Location: Amado, Arizona
Image ID: 23031  
Black-headed grosbeak, immature, Pheucticus melanocephalus, Madera Canyon Recreation Area, Green Valley, Arizona
Black-headed grosbeak, immature.
Species: Black-headed grosbeak, Pheucticus melanocephalus
Location: Madera Canyon Recreation Area, Green Valley, Arizona
Image ID: 23089  
Black-headed grosbeak, immature, Pheucticus melanocephalus, Madera Canyon Recreation Area, Green Valley, Arizona
Black-headed grosbeak, immature.
Species: Black-headed grosbeak, Pheucticus melanocephalus
Location: Madera Canyon Recreation Area, Green Valley, Arizona
Image ID: 23092  
The Lamar herd of bison grazes, a mix of mature adults and young calves, Bison bison, Lamar Valley, Yellowstone National Park, Wyoming
The Lamar herd of bison grazes, a mix of mature adults and young calves.
Species: American bison, Bison bison
Location: Lamar Valley, Yellowstone National Park, Wyoming
Image ID: 13131  
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, Bison bison, Yellowstone National Park, Wyoming
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  
The Hayden herd of bison grazes, a mix of mature adults and young calves, Bison bison, Hayden Valley, Yellowstone National Park, Wyoming
The Hayden herd of bison grazes, a mix of mature adults and young calves.
Species: American bison, Bison bison
Location: Hayden Valley, Yellowstone National Park, Wyoming
Image ID: 13141  
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