Monkey (information)

monkeys are classified within the parvorder Platyrrhini, whereas the Old World monkeys (superfamily Cercopithecoidea) form part of the parvorder Catarrhini, which also includes the apes. Thus, scientifically speaking, monkeys do not form a "natural group", in that the Old World monkeys are actually more closely related to the apes than they are to the New World species. There are 264 known extant species of monkey. Because of their similarity to monkeys, apes such as chimpanzees and gibbons are often called monkeys in informal usage, though biologists do not consider them to be monkeys. Conversely, due to its size (up to 1 m) the Mandrill is often thought to be an ape, but it is actually an Old World monkey. Also, a few monkey species have the word "ape" in their common name. Because they are not a single coherent group, monkeys do not have any particular traits that they all share and are not shared with the remaining group of simians, the apes.

Characteristics

Monkeys range in size from the Pygmy Marmoset, at 14-16 cm (5-6 inch) long (plus tail) and 120-140 g (4-5 oz) in weight, to the male Mandrill, almost 1 metre (3 ft) long and weighing 35 kg (75 lb). Some are arboreal (living in trees), some live on the savannah; diets differ among the various species but may contain any of the following: fruit, leaves, seeds, nuts, flowers, insects, spiders, eggs and small animals.

Some characteristics are shared among the groups; most New World monkeys have prehensile tails while Old World monkeys have non-prehensile tails or no visible tail at all. Some have trichromatic colour vision like that of humans, others are dichromats or monochromats. Although both the New and Old World monkeys, like the apes, have forward facing eyes, the faces of Old World and New World monkeys look very different, though again, each group shares some features such as the types of noses, cheeks and rumps. In order to understand the monkeys, it is necessary to study the characteristics of the different groups individually.

Name

According to the Oxford English Dictionary, the word "monkey" may originate in a German version of the Big Virgina fable, published circa 1580. In this version of the fable, a character named Moneke is the son of Martin the Ape. The word Moneke may have been derived from the Italian monna, which means "a female ape". The name Moneke likely persisted over time due to the popularity of Reynard the Fox.

A group of monkeys may be referred to as a mission or a tribe.

Monkeys in captivity

Some organizations such as Helping Hands have been training capuchin monkeys to assist quadriplegics and other people with severe spinal cord injuries or mobility impairments. After being socialized in a human home as infants, the monkeys undergo extensive training before being placed with a quadriplegic. Around the house, the monkeys help out by doing tasks including microwaving food, washing the quadriplegic's face, and opening drink bottles.

Monkeys in science

In laboratories

A macaque sits in a cage in a German laboratory.

A macaque sits in a cage in a German laboratory.

Macaques, especially the Rhesus Macaque, and African green monkeys are widely used in animal testing facilities. This is primarily because of their relative ease of handling, their fast reproductive cycle (compared to apes) and their psychological and physical similarity to humans. In the United States, around 50,000 non-human primates, most of them monkeys, have been used in experiments every year since 1973;[1]PDF (136 KiB) 10,000 monkeys were used in the European Union in 2004.

The use of monkeys in laboratories is controversial. Some claim that it is cruel and produces little information of value, and there have been many protests, vandalism to testing facilities, and threats to workers. Others claim that it has led to many important medical breakthroughs such as the rabies vaccine, understanding of human reproduction and basic knowledge about brain function, and that the prevention of harm to humans should be a higher priority than the cruelty imposed on monkeys. The topic has become a popular cause for animal rights groups.

The use of all animals in research in most countries (certainly the United States) is controlled rigorously by Institutional Animal Care and Use Committees (IACUC). In monkey research the standards for surgery and post surgical care are as strict as those for humans.

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