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Altruism (biology) Olive baboons grooming. In biology, altruism refers to behaviour by an individual that increases the fitness of another individual while decreasing their own. [1] Altruism in this sense is different from the philosophical concept of altruism, in which an action would only be called "altruistic" if it was done with the ...
The concept of "reciprocal altruism", as introduced by Trivers, suggests that altruism, defined as an act of helping another individual while incurring some cost for this act, could have evolved since it might be beneficial to incur this cost if there is a chance of being in a reverse situation where the individual who was helped before may perform an altruistic act towards the individual who ...
A Darwinian puzzle is a trait that appears to reduce the fitness of individuals that possess it. Such traits attract the attention of evolutionary biologists. Several human traits pose challenges to evolutionary thinking, as they are relatively prevalent but are associated with lower reproductive success through reduced fertility and/or longevity.
Though altruism and spitefulness appear to be two sides of the same coin, the latter is less accepted among evolutionary biologists. First, unlike the case with the beneficiary of an altruistic act, targets of aggression are likely to act in revenge: bites will provoke bites. Thus harming non-kin may be more costly than helping kin.
Adaptive behavior (ecology) In behavioral ecology, adaptive behavior is any behavior that contributes directly or indirectly to an individual's reproductive success, and is thus subject to the forces of natural selection. [1] Examples include favoring kin in altruistic behaviors, sexual selection of the most fit mate, and defending a territory ...
Models of food-sharing are based upon general evolutionary theory. When applied to human behavior, these models are considered a branch of human behavioral ecology. Researchers have developed several types of food-sharing models, involving phenomena such as kin selection, reciprocal altruism, tolerated theft, group cooperation, and costly ...
Parochial altruism is a concept in social psychology, evolutionary biology, and anthropology that describes altruism towards an in-group, often accompanied by hostility towards an out-group. [1] It is a combination of altruism, defined as behavior done for the benefit of others without direct effect on the self, and parochialism, which refers ...
Of the 1,000 people who were surveyed, results indicated that about 41 percent of Americans are on the fence about dinosaurs and humans coexisting. 14 percent of people responded with 'definitely ...