Altruism, or act a benefit to the recipient and costs means for the performer, is one of the paradoxes of evolution. In the wild, where the law of the strongest prevails, can not really be reconciled with Darwinian evolution. Adoption of the offspring of other animals And yet, among bees, dolphins, lions and other primate species, altruism can go as far as adoption. The fostering of social insects, made a mistake exposed in Darwin's theory of evolution by natural selection: the biologist noted that non-reproductive insects that boy adopt and help a large portion of genetic baggage
their parents give to this adopted son. Darwin had to broaden his theory of evolution of the individual to the family group. What is the benefit for adoption in mammals, including humans? Bears the adopted something to the survival of his adoptive parents in the years following an adoption, and vice versa? The controversy lies at the basis of this documentary, remains much debated in today's scientific world. The documentary examines each case individually because each adoptive behavior has evolved independently, with its own pattern, and even own advantages. its own drawbacks.
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