Bonobo Chimps have been found to be one of the few animal species to demonstrate selfless acts of kindness. A chimp (no. 1) in a zoo was placed in a cage full of tasty food. In the cage next to him was another chimp (no. 2) with no food. The door between the two cages could only be opened by chimp no. 1. Before he even began to eat, he opened the door to allow the other chimp to share the food with him. The article I read this in drew a comparison to a human selfless act of kindness - giving blood.