When your dog's big, pleading eyes look up at you, is it with old-age wisdom or teenage naiveté?
A pair of mated male penguins in a Dutch zoo were so eager for offspring that they stole an egg from another couple's nest.
A previously unknown species of primitive bird has a tail feature associated with flight in modern birds.
Gigantopithecus, an enormous extinct ape that lived in Asia millions of years ago, was a close relative of the modern orangutan.
Scientists reveal more mysteries about the bizarre Tully Monster, an ancient sea creature with stalked eyes that has defied classification.
Scientists used a computer program to uncover more than 1 million molecules that could potentially store genetic information, just like DNA.
With a series of camera traps, researchers have caught the silver-backed chevrotain meandering about its tree-filled home.
Paleontologists in Poland unearthed the jaws and teeth of a pliosaur, an ancient marine reptile with a bite more powerful than that of T. rex.
After a group of worker ants became trapped in a sealed nuclear bunker in Poland, they formed a queen-free "colony" that survived through cannibalism.
A trio of divers off the western coast of Norway had a close encounter with a drifting gelatinous blob — a squid's egg sac as big as an adult human.
Gooey, sticky slime isn't just gross; it's crucial for the survival of a wide variety of animals and plants, many of which are featured in the new book "Believe It or Snot."
The Paris Zoological Park is debuting a new exhibit on 'the blob' — a brainless, single-cell slime mold with incredible problem-solving potential.
Head-bobbing might make pigeons look ridiculous, but there's a practical purpose behind this very strange display.
Trilobites fossilized in Morocco seem to have been buried by a storm as they marched in an orderly queue.
While playing a game, monkeys switched strategies each round, while humans stuck to a set of inefficient rules.