(Forschungsverbund Berlin) Aggressiveness among animals may increase the longer individuals live together in stable groups. This is the finding of a recent study carried out by researchers from the Leibniz-Institute of Freshwater Ecology and Inland Fisheries. The study, published in the journal Animal Behaviour used the Amazon molly, a naturally clonal fish species that produces genetically identical individuals to isolate the effects of familiarity on behavior.
from EurekAlert! - Social and Behavioral Science http://bit.ly/2tw1mb8
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