Dolphins
Each dolphin has a name to which it responds among its relatives. Dolphins also have one unique characteristic – they never sleep. In the usual sense for us. Their right and left hemispheres are alternately awake and asleep.
Cows
Ravens are self-aware and perfectly recognize their reflection in the mirror. They know how to make and use tools. For example, crows use sticks to knock apples off a tree. They can also perfectly distinguish volume, weight and material from which the object is made. That is why these birds will never put a piece of wood in a container to raise the water level in it. But the stone is easy!
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