Unique creatures, odd animals and new species are discovered across the planet. Some are found lurking in remote corners of the world, while others have been hiding right under our noses. Learn more ...

The theory, outlined in the journal Nature Ecology & Evolution, explains why lean, medium-sized animals are generally built for speed. It applies to animals from fruit flies to blue whales and ...

The “chicken hawk” of colonial America, this medium-sized accipiter is a common sight at home bird feeders across the country, swooping in to nab an unwary dove or jay. Females are larger and ...

Native to Tasmania, Australia and New Guinea, it hunted small to medium-sized animals and led a solitary, elusive life. The Tasmanian tiger was driven to extinction in the 20th century due to ...