One of the Southern Resident orcas, a 47-year-old female known as L47, hasn't been seen by census takers since February.
Maya people who had fled their cities after a volcano erupted returned and built an enormous pyramid from the volcanic debris.
The short film "Life Beneath the Ice" features delicate, illuminated marine creatures living under the sea ice in Antarctica.
A farmer in Russia's Stavropol region found the waterlogged "king." Specimens of rat kings are preserved in the collections of some natural history museums.
Over 100,000 years ago, extinct relatives of modern elephants lived in matriarchal groups, according to preserved trackways in southwestern Spain.
A newly described extinct giant penguin from New Zealand has unusually long legs and a long, slender beak, and it dates to a time when much of the region was underwater.
For millennia, the function and importance of this singular organ has fascinated physicians, philosophers and artists around the world.
Our quest to understand how the heart works — in ourselves and in other animals — has inspired philosophers and artists as well as doctors and researchers.
Tardigrades, often called water bears or moss piglets, are near-microscopic animals that are almost indestructible and can even survive in outer space.
These ghastly meals provide male butterflies with chemicals that they use to produce mating pheromones, which female butterflies find irresistible.
A newly described species of mosasaur, an extinct marine reptile, swam through Cretaceous seas 80 million years ago and had a slender snout like a crocodile's.
Thylacines, once widespread in Australia, have been extinct for nearly a century, but newly colorized footage provides a glimpse of what they looked like in life.
An ocean creature that lived around 500 million years ago was the largest predator on the sea bottom.
The largest triceratops in the world, scheduled to be auctioned on Oct. 21, will be on display to the public in Paris beginning Sept. 16.
A new analysis of shoes that may have belonged to the Renaissance artist Michelangelo revealed his small stature.
Meet "Attenborough's Beauty," an ancient beetle that was so exceptionally well-preserved you can still see the colorful patterns on its wing case.
An adult mammoth's preserved tusk revealed how far the animal ranged across Alaska during its 28-year lifetime.
A pterosaur "dragon" that lived in Australia during the Cretaceous was the continent's biggest flying reptile, according to a new analysis of a fossil jawbone.
Hundreds of scientists with a UN panel reviewed more than 14,000 studies documenting climate change evidence, to create a new report for policymakers worldwide.
Storm formation during the 2021 Atlantic hurricane season will be higher than previously predicted, according to an update by NOAA scientists.