In the wild, chimpanzees face any number of dire threats, ranging from poachers to predators to deforestation.
Marcelino is calling to her, but Cecilia cannot be with him. Not yet. He may be handsome, but she has suffered a lot and isn't ready for a relationship.
Since at least the 1920s, anecdotes and some studies have suggested that chimpanzees are "super strong" compared to humans, implying that their muscle fibers, the cells that make up muscles, are superior to humans.
Research by Dr Nicholas Newton-Fisher from the University of Kent has found chimpanzees modify their interactions with other chimpanzees if higher ranking members of their community are nearby.
Think of all the things your mom taught you—sit up straight, close your mouth when you chew, remember to say please and thank you … the list goes on.