An assortment of zebra finches studied by Sarah Woolley, a neuroscientist at Columbia University. Dr. Woolley found that finches were expert at learning the songs of their fathers for later in life, when it comes time to find a mate.
The population of western monarch butterflies in California dropped to a record low last year, according to a nonprofit conservation group.
Sudan, the last male northern white rhino, who died in March.
Radar images of a near-Earth asteroid collected in 2015. Since 2011, a NASA project called Neowise has studied 158,000 asteroids. But Microsoft’s former chief technologist, Dr. Nathan P. Myhrvold, criticized those numbers. “The science is terrible,” he said.
Two images of the same cuttlefish, taken fewer than two seconds apart, showing how quickly it can change color.
An Oriental fire-bellied toad, which was imported into Europe from South Korea.
An artist’s rendering of an Earthlike exoplanet orbiting another. Scientists haven’t been able to measure an exoplanet’s tilt yet, but some suspect that a planet’s tilt is key to supporting life.
Carl Hart, an associate professor at Columbia University, is the author of the book “High Price,” a mix of memoir and scientific research about drug addiction.
A specimen of the Chimerarachne yingi, an ancient relative of spiders that had a long, whip-like tail that was probably used as a sensory organ.
A field technician excavating the remains of an amputated limb at Manassas National Battlefield Park in October 2015. The discovery of two nearly complete sets of soldiers’ remains, 11 partial limbs and other artifacts appeared to date to the Second Battle of Bull Run, which ended Aug. 30, 1862.
Earth’s gravitational interactions with other planets — particularly Venus, because it is very near — affect the shape of its orbit.
Alia Lesnek, left, and Charlotte Lindqvist of the University at Buffalo, observing boulders on Dall Island in Alaska. Scientists have found evidence in Alaska’s rocks that the first people to populate the Americas were island-hopping sea-farers.
S. Alan Stern, center, New Horizons’ principal investigator, surrounded by children at Johns Hopkins University Applied Physics Laboratory in Laurel, Md., on Tuesday.
There were nine species of the flightless birds called the moa.
An artist’s rendering of the European Space Agency’s Mars Express spacecraft searching the planet’s south pole for liquid water.
Merino sheep on a farm in Alexandra, New Zealand. Scientists found that differences in the cells on a hair explain a sheep’s curls, and may offer insights for other mammals, like us.
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