Date: February 1, 2018
Source: University of Bern
Summary:
Researchers have shown for the
first time in an experiment that non-human animals can also exchange different
kind of favors. Humans commonly trade different commodities, which is
considered a core competence of our species. However, this capacity is not
exclusively human as Norway rats exchange different commodities, too. They
strictly follow the principle "tit for tat" -- even when paying with
different currencies, such as grooming or food provisioning.
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