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Poppy flowers photographed at the El Uno Ecological Reserve (Rancho El Uno) near Janos, Chihuahua, in northern Mexico.
Lemon sharks glide through the ocean's clear waters.
Showy evening primrose in restored prairie at the Derr Tract, Nebraska.
Red-eyed tree frogs in Sarapiquí, Costa Rica.
Male Yellow Warbler photographed in spring at the Canaan Valley Wildlife Refuge, West Virginia.
Sunrise over wetlands at Blackwater Falls State Park in West Virginia.
Early morning at Francis Beach on Half Moon Bay, San Mateo County, California.
Lightning at sunset over Lake Ogallala, Keith County, Nebraska.
Chimpanzee in the forest at Mahale National Park on Lake Tanganyika in Tanzania.
Landscape view of Child's Meadow with surrounding evergreen forest and lichen covered rocks, remnants of the Lassen Volcanic eruption millions of years ago, California.