An orca whale has carried her dead calf on her nose for days in the Pacific Northwest.
A sauropod footprint found in Scotland was among several that included tracks left by smaller, two-legged meat-eaters. Their presence together upends a theory that the larger plant-eaters waded into shallow, muddy waters to evade predators.
The Tremaster mirabilis starfish, one of several species of sea star living in deep waters off Greenland’s coast that have surprisingly complex eyes.
Adult emperor penguins and their chicks near a research station in Terre Adélie, Antarctica. Researchers found that male penguins from one colony often slipped out to hunt during breeding season.
Orcas from pod J in Puget Sound just west of Seattle. The number of orcas in the area, listed as endangered since 2005, has dwindled to a 30-year low.
The astronauts named by NASA to fly on commercial spacecraft made by Boeing and SpaceX to and from the International Space Station: From left, Sunita Williams, Cmdr. Josh Cassada, Eric Boe, Lt. Col. Nicole Mann, Christopher Ferguson, Douglas Hurley, Col. Bob Behnken, Col. Mike Hopkins and Cmdr. Victor Glover.
Researchers at the University of Glasgow studied physiological indicators of stress in clown fish living with bleached anemones, a result of warming temperatures and other environmental disturbances.
A view of the asteroid Ryugu captured by the Hayabusa2 spacecraft on Sunday, from a distance of about 40 kilometers.
Alfalfa leafcutter bees and their brood cells in a hut built by Jim Watts, who runs a business providing bees to farmers out of Ontario, Ore.
The carcasses of 300 reindeer on a plateau in Norway may help engender new plant diversity, according to scientists.
A thermal image of elephants, part of an effort to apply tools from astronomy to help conservationists and fight poaching.
A piece of plastic polymer about to be destroyed under ultraviolet light.
A fossil of a cockroach dating to the Cretaceous period, about 145 to 65 million years ago. Insects took to the skies much earlier, but there is scant fossil evidence from the period showing how they evolved wings.
Lee Se-dol, a professional Go player from South Korea, was smiling amid other players despite losing four of five games against a Google computer program called AlphaGo.
The population of western monarch butterflies in California dropped to a record low last year, according to a nonprofit conservation group.
A northern quoll bred at a wildlife park in 2016. Scientists hope breeding programs can help quolls inherit life-saving genes.
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