8/18/2023 0 Comments Chimpanzee facts on them habitatIn 2007, the result of the DNA sequencing of the rhesus monkey genome was published in the journal Science. Worldwide, rhesus monkeys are primarily used as experimental animals in infection research, drug development and in brain research. Rhesus monkeys for research are nowadays bred in special facilities such as the German Primate Center with high sanitary standards and are therefore no longer removed from their natural habitat. Around the end of the seventies, the Indian government stopped the export of monkeys in order for the population growth to recover. Through the consequent massive export of rhesus monkeys from India to the respective destination countries, their populations decreased rapidly at times. Through experiments on rhesus monkeys, scientists were able to develop the vaccine against the poliovirus in the fifties, where today millions of people are protected from infection. This important finding henceforth prevented fatal immune reactions in blood transfusions and during pregnancy. The rhesus factor was later found in humans. In 1940, the rhesus factor, named after them was discovered in their blood. Rhesus monkeys have long been used as experimental research animals. After two weeks the infants are ready to take solid food and after six months, it can take care of itself. During the first weeks the infant is carried around on the belly or on the back of the mother who intensively cares for it. After a gestation period of about 166 days, the female gives birth to a baby that weighs between 450 and 500 grams. Births occur most frequently in the pre - and post monsoon period. In the lowlands, reproduction is dependent on the monsoon season. The infants are therefore born during the spring time. Rhesus monkeys that live in cold-winter areas usually mate in the fall. The mating times vary and are dependent on the habitat. Females reach sexual maturity with three and a half to five and a half years, males slightly later with six and a half years. However, the reproductive behavior of rhesus monkeys is characterized by promiscuity. ![]() Mating takes place between members of equal ranking in the group. The females remain in their birth group, while the males form small bachelor groups and leave the group when they reach sexual maturity. Hierarchies are formed from in both sexes, whereby those of the females are more stable and lasting than those of the males. The rhesus monkey groups consist of several males, females and young animals. The individual areas of neighboring groups can overlap significantly but since the outnumbered group rapidly withdraws during confrontations, hostilities are rare. Although rhesus monkeys live in group association, they are not very territorial. The size of their home ranges is highly variable and could encompass the size of a few hundred meters to several kilometers. They like to bath and are therefore good swimmers. Rhesus monkeys run on the ground on all fours and are good climbers and jumpers. ![]() They spend most of the day with foraging and eating. ![]() They live in groups of 20 to 200 animals and live on the ground or in trees depending on the habitat. Rhesus monkeys are highly vivacious and active animals. Near human settlements they frequently plunder fields and gardens with grown crops or search garbage cans for edibles. Their meat diet derives mostly in the form of insects, spiders, crustaceans and bird's eggs. Their diet consists mainly of plant material.
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