Some consider the gifts to be a form of reciprocal altruism.

So, it looks like a promising case for a bit of reciprocal altruism.

Water was shared and controlled through a process involving reciprocal altruism.

A further criticism is that language doesn't work on the basis of reciprocal altruism anyway.

Other theories followed, some derived from game theory, such as reciprocal altruism.

This is a well established, documented and demonstrated part of reciprocal altruism.

Therefore, the bats do not seem to qualify yet as an example for reciprocal altruism.

This has been noted by many naturalists as an example of reciprocal altruism in nature.

This is similar to superrationality and reciprocal altruism in biology.

Reciprocal altruism is one process by which this is accomplished.

In reciprocal altruism individuals are not required to have any particular genetic relatedness with one another.

'Reciprocal altruism' is envisaged as the second main form of social behaviour.

Evolutionary scientists have developed a model to explain reciprocal altruism among closely related individuals.

However, showing reciprocal altruism in an unambiguous way requires more evidence as will be shown later.

Thus, it seems much more probable that this example is a case of kin selection than reciprocal altruism.

Grooming and support in conflict among primates is considered to be an act of reciprocal altruism.

"Reciprocal altruism is the underlying process that allows the free agent economy to function," the author writes.

The concept of reciprocal altruism is a central theme of this documentary.

Vampire bats also display reciprocal altruism, as described by Wilkinson.

To qualify for reciprocal altruism, the benefit to the receiver would have to be larger than the cost to the donor.

Some of the behaviors associated with living in large groups include reciprocal altruism, deception and coalition formation.

Packer (1977) has shown that baboons are capable of reciprocal altruism.

Reciprocal altruism in evolutionary biology and rational choice theory.

Instead, he claims, a more convincing explanation is to be found in the concepts of reciprocal altruism and kin selection.

On the other hand, "being wired to help other rats" could be a way to facilitate reciprocal altruism.