Monkeys are intelligent animals and they seem to explore many of the same emotions that we do including love, anger, grief and sadness. They also appear to play and laugh. They are able to communicate with each other through body language as well. One way they do this is by grooming one another. Grooming helps them remove parasites and keep their fur clean but it also seems to be a way of showing affection or making peace with others in their troop.
Typically, monkeys are arboreal, living in the trees but some species live on the ground. The term “monkey” generally refers to any New World or Old World primate that is not an ape or a prosimian, the other groups of higher primates (the infraorder Similformes).
Some monkeys have prehensile tails and use them to hold onto branches while moving through the trees. Others use their arms to swing from branch to branch, a move known as brachiation. Still others walk on all fours, a movement called quadrupedalism. Some monkeys, such as baboons, have long, flattened nails on all their digits, while New World monkeys have a thumb in line with the other digits and some have toenails on the big toe.
Most species of monkeys are diurnal, active during the day. But some, such as spider monkeys, are nocturnal. Other monkeys, such as colobus monkeys and apes, have large brains for their size, giving them the ability to learn and remember.