Some animals are so unusual that they barely look real, and transparent creatures are among the strangest of them all. These ...

The natural world is full of wonders that often seem to defy belief. Some creatures are so extraordinary, they look as if they’ve leaped right out of ancient myths and legends. From bizarre deep-sea ...

In 1897 Russian physiologist Ivan Pavlov proved that animals can be trained using associative learning. A new study finds that even single-celled organisms can behave like “Pavlov's dog.” ...

Discover 15 incredible animals we might lose by 2030. See the rare photos and facts about these endangered species.

Some animals have abilities that seem almost unreal, from invisibility to electric powers and extreme regeneration. Discover ...

While much attention in the animal kingdom goes to speed and agility, some creatures have mastered the art of moving slowly. These animals thrive by conserving energy, avoiding predators, or adopting ...