Male elk bugling during the fall rut. Large male elk are known as bulls. Male elk have large antlers which are shed each year. Male elk engage in competitive mating behaviors during the rut, including posturing, antler wrestling and bugling, a loud series of screams which is intended to establish dominance over other males and attract females.
Species: Elk, Cervus canadensis
Location: Mammoth Hot Springs, Yellowstone National Park, Wyoming
Image ID: 19693
A rainbow appears in the mist of the Lower Falls of the Yellowstone River. At 308 feet, the Lower Falls of the Yellowstone River is the tallest fall in the park. This view is from Lookout Point on the North side of the Grand Canyon of the Yellowstone. When conditions are perfect in midsummer, a midmorning rainbow briefly appears in the falls.
Location: Grand Canyon of the Yellowstone, Yellowstone National Park, Wyoming
Image ID: 13319
Grand Prismatic Spring (left) and Excelsior Geyser (right). Grand Prismatic Spring displays a stunning rainbow of colors created by species of thermophilac (heat-loving) bacteria that thrive in narrow temperature ranges. The blue water in the center is too hot to support any bacterial life, while the outer orange rings are the coolest water. Grand Prismatic Spring is the largest spring in the United States and the third-largest in the world. Midway Geyser Basin.
Location: Midway Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 13571
Old Faithful geyser, sunrise. Reaching up to 185' in height and lasting up to 5 minutes, Old Faithful geyser is the most famous geyser in the world and the first geyser in Yellowstone to be named.
Location: Upper Geyser Basin, Yellowstone National Park, Wyoming
Image ID: 26939
Australian Sea Lion Underwater, Grindal Island. Australian sea lions are the only endemic pinniped in Australia, and are found along the coastlines and islands of south and west Australia.
Species: Australian Sea Lion, Neophoca cinearea
Location: Grindal Island, South Australia
Image ID: 39155
Milky Way and Shooting Star over Delicate Arch, as stars cover the night sky.
Location: Arches National Park, Utah
Image ID: 27854
Australian Sea Lion Underwater, Grindal Island. Australian sea lions are the only endemic pinniped in Australia, and are found along the coastlines and islands of south and west Australia.
Species: Australian Sea Lion, Neophoca cinearea
Location: Grindal Island, South Australia
Image ID: 39156
California brown pelican in flight, spreading wings wide to slow in anticipation of landing on seacliffs. Note the classic winter breeding plumage, with bright red throat, yellow and white head and neck, and brown hind neck. Other pelicans and cormorants at the periphery of the image hint at how crowded the cliff is with other birds.
Species: Brown Pelican, Pelecanus occidentalis, Pelecanus occidentalis californicus
Location: La Jolla, California
Image ID: 36679
Dusk settles on downtown San Diego with snow-covered Mount Laguna in the distance.
Location: San Diego, California
Image ID: 26716
Childrens Pool Reef Exposed at Extreme Low Tide, La Jolla, California. Aerial panoramic photograph.
Location: La Jolla, California
Image ID: 37946
Panorama dimensions: 6176 x 11395
Australian Sea Lions in Kelp, Grindal Island. Australian sea lions are the only endemic pinniped in Australia, and are found along the coastlines and islands of south and west Australia.
Species: Australian Sea Lion, Neophoca cinearea
Location: Grindal Island, South Australia
Image ID: 39163
Australian Sea Lion Underwater, Grindal Island. Australian sea lions are the only endemic pinniped in Australia, and are found along the coastlines and islands of south and west Australia.
Species: Australian Sea Lion, Neophoca cinearea
Location: Grindal Island, South Australia
Image ID: 39164