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Tigers are carnivores with a shrinking range in Asia and the Russian Far East.
The adaptable coyote, usually considered a carnivore, will also eat berries.
Deer browse on plants, often defoliating shrubs and trees in suburban yards.
Mountain yellow-legged frog: Disease has left it high and dry in its aquatic habitat.
Scientist Vance Vredenburg is shown with one of the frogs he and his colleagues study.
An adult female mountain yellow-legged frog with a radio belt for tracking.
Research site: the Sixty Lakes Basin of Kings Canyon National Park in the Sierra Nevada.
A pair of now-rare mountain yellow-legged frogs in the Sierra Nevada mountains of Calif.
The mountain yellow-legged frog is an amphibian species affected by the chytrid fungus.
Video type: Brightcove Video Cloud
Scientists have determined first-ever census for emperor penguins.
Penguin census doubled previous estimates.
Chris Funk, Rachel Harrington, Brian Gill and Dave Martin sampling in the Indian Peaks Wilderness.
Researchers Kayce Anderson and Brian Gill at a site beneath a waterfall along the Oyacachi.
A project site in Colorado: A creek above Lake Isabella in the Indian Peaks Wilderness.
The omnipresent fog of the cloud forest in Ecuador's Oyacachi watershed.
Scientist LeRoy Poff samples aquatic insects along a vine-choked stream in Ecuador.
The Rio Santa Maria, a tributary of the Oyacachi River in Ecuador, runs fast after heavy rains.
Dawn breaks over fields, some fertilized, some not, at the KBS site.
Research on fields in all stages of ecological succession is conducted at KBS.
Where does nitrogen fertilizer go? Studies of crops hold answers.
Agricultural crops are studied in experiments at NSF's Kellogg Biological Station LTER site.
An aerial view of agriculture experiments at the Kellogg Biological Station.
Scientists at the KBS LTER site research agriculture and climate change.
Illustration depicting several of the components contained in a massive shake-table experiment.