Man - not only being experienced by midlife crisis. It turned out, he exposed and the great apes - orangutans and chimpanzees.
The conclusion reached by an international team of researchers, based on the results of the study of 508 monkeys which are in zoos and reserves of the United States, Japan, Canada, Australia and Singapore. The level of well-being was assessed by adapted "human" figures employees zoos and reserves, familiar with animals.
It was found that "the curve happiness" monkey has the same U-shape as is characteristic of humans. The recession accounts for the same "relative age" (in terms of proportion to life expectancy).