In the past, many scientists believed that only mammals and birds could feel or think in complex ways. Reptiles, fish, and insects were seen as simple creatures that reacted purely on instinct. But ...

The sprawling-upright transition across mammal evolution, showing changes in posture and limb bone shape. The transition from sprawling (reptile-like) to more upright (parasagittal) posture and ...

Amphibians are animals that are born in water but can survive in both water and land when growing up. These amazing creatures ...

Sleep is a universal biological state that allows all animals, from mammals to amphibians, fish and even insects, to restore their energy and consolidate knowledge that can contribute to their ...