Science has documented the homosexual behavior in about 1,500 species of all orders of the animal kingdom, from insects even the primates, passing through spiders, dolphins or nematodes. This universality may have baffled Charles Darwin. In fact, sexual relations with peers of the same sex is considered a Darwinian paradox: from the point of view of The theory of evolution, represents a cost to the biological effectiveness of the individual as it does not have a direct effect on the ultimate goal, the perpetuation of the species. But there may be other indirect effects that explain not only its survival, but also give it a prominent role in the evolution of a good part of living beings. This is what is suggested by a scientific work that shows how homosexual behavior in mammals, although a minority, is more frequent in the more social species.
