Eusociality in a mammal: cooperative breeding in naked mole-rat colonies.

@article{Jarvis1981EusocialityIA,
  title={Eusociality in a mammal: cooperative breeding in naked mole-rat colonies.},
  author={Jennifer U. M. Jarvis},
  journal={Science},
  year={1981},
  volume={212 4494},
  pages={
          571-3
        }
}
Laboratory observations on a field-collected colony of 40 Heterocephalus have shown that only a single female breeds. The remaining individuals constitute two or three castes, each containing both sexes and distinguishable by size differences and the tasks they perform. These features, together with long life-spans, overlap of generations, cooperative brood care, and possible age polyethism provide parallels with the eusocial insects. 
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Social Behavior in Naked Mole-Rats: Individual Differences in Phenotype and Proximate Mechanisms of Mammalian Eusociality.
TLDR
Naked mole-rats provide the opportunity to examine the proximate mechanisms controlling individual differences in social behavior, shedding light on how mammals live in complex social groups.
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