A new technique that looks at chemical clues in seawater suggests that the meteorite that wiped out the dinosaurs 65 million years ago was a mere 2.5 to 3.7 miles (4 to 6 kilometers) across.
A system of underwater listening posts off the New England coast detects whale sounds and then automatically alerts ships to slow down to avoid killing the critically endangered animals.
Claude, an Asiatic black bear living in a Japanese zoo, has attracted attention for twirling sticks. The habit could be an act of boredom or play, experts say.
The largest freshwater fish ever caught, the Mekong giant catfish, could face extinction if a large dam is completed in Laos, experts say. Part six of an ongoing series on megafishes.
Proteins in the reptiles' blood have been shown to kill drug resistant bacteria and even to partially destroy the virus that causes AIDS, researchers announced.
Medieval-era skulls unearthed from the Tower of London represent the oldest confirmed Barbary lions, a subspecies that has died out in the wild, DNA reveals.
Wild octopuses engage in "jealous murders," gender bending, and once-in-a-lifetime sex, unlike their seemingly shy, unromantic captive brethren, a new study says.
