People with this chronotype follow the rise and fall of the sun. Bears spend most of their day awake and sit pretty much in ...

Sleeping with half of their brain at a time ... do that. So, if you see a dolphin hovering near the surface of the ocean with ...

For a dolphin, the amount of energy required depends on whether the animal is resting, sleeping, diving or swimming, as well as the temperature of the ocean. Finding out more about the diet and ...