Ornithologists tagged 27 juvenile birds to track the way they use updrafts of air heated by the sun to migrate over long distances.

A study of 686 fish and invertebrates predicts that some animals will have to shift more than 1,000 kilometers to stay within tolerable temperatures.

Crowds of zooplankton swimming upward generate large downward jets of water, a study finds.

In an unusual evolutionary twist, local stick spiders have come up with an almost identical repertoire of color morphs in multiple locations.

The animal pictures and hand stencils were made in caves in Spain thousands of years before Homo sapiens arrived in Europe.

Studies suggest not all critters fare well in extreme weather, though some thrive.

When thousands of animals die during mass migrations, ecosystems accommodate the corpses and new cycles are set in motion.

When scores of migrating wildebeest fail to survive a treacherous river crossing, their corpses fuel thriving ecosystems.

Marabou storks on Kenya’s Mara River feast on the carcasses of migrating wildebeest that failed to make it across the waterway.

Mitochondrial DNA in Neanderthal bone suggests humans first left Africa earlier than previously thought.