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A sweeping global report finds that migratory freshwater fish are in steep decline, with populations down roughly 81% since 1970. These species depend on long, connected rivers, but dams and human pressures are cutting off their routes. Hundreds of . ...

A cow named Veronika has stunned scientists by using tools in a flexible and purposeful way. She chooses different ends of a brush depending on the part of her body and adjusts her movements accordingly. This level of tool use is incredibly rare and ...

By closely monitoring fish throughout their lives, researchers found that simple behaviors in midlife--like movement and sleep--can predict lifespan. Fish that stayed active and slept mostly at night tended to live longer, while those slowing down .. ...

Snow flies have an unexpected way of surviving freezing temperatures. They produce antifreeze proteins to block ice formation and can even generate their own heat. Scientists also found that their genes are unusually unique, and they feel less cold . ...

Deep inside a cave, scientists uncovered fossils from 16 species, including a newfound kkp ancestor that may have been able to fly. These remains reveal that New Zealand's ecosystems were constantly disrupted by volcanic eruptions and rapid climate . ...

When temperatures plunge, the risk to your heart rises dramatically. A large U.S. study shows cold weather is linked to far more cardiovascular deaths than heat, accounting for tens of thousands of extra deaths each year. Scientists found the safest ...

In a remarkable deep-sea breakthrough, researchers have discovered 24 new species of amphipods in the Pacific's Clarion-Clipperton Zone--including a rare, entirely new superfamily. The findings reveal previously unknown branches of life and push the ...

Flower nectar often contains small amounts of alcohol, meaning pollinators like hummingbirds are drinking it all day long. Despite consuming human-equivalent amounts, they show no signs of intoxication--suggesting a surprising evolutionary tolerance.

Honey bees don't just perform their famous waggle dance to share directions, they actually adjust how well they dance depending on who's watching. Researchers found that when fewer bees pay attention, the dancer becomes less precise as it moves ...

Scientists have uncovered a new species of rhinoceros in the Canadian High Arctic, revealing that rhinos once lived far farther north than expected. The fossil, dating back 23 million years, is unusually complete and has helped reshape ideas about .. ...