lifespan and brain size tend to increase with animals’ size, maximum running speeds tend to be greatest in medium-sized animals. To explore why this is, the international research team developed ...

animals, environments, and experiences from an early age. Socialization helps dogs develop confidence and learn how to interact with others. For medium-sized family dogs, socialization is crucial ...

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 ...