Noun
eusociality (uncountable)
English Wikipedia has an article on:eusocialityWikipedia
(biology) Reproductive specialization, in which most individuals of a species are genetically infertile; the state of being eusocial.
Because of this, cooperation among kindred females may be unusually advantageous, and has been hypothesized to contribute to the multiple origins of eusociality within this order. Source: Internet
This unusual situation has been proposed as an explanation of the multiple independent evolutions of eusociality (arising at least nine separate times) within the Hymenoptera. Source: Internet