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Eusociality (Greek εὖ eu "good" and social) is the highest level of organization of sociality. It is defined by the following characteristics: cooperative brood care

The use of the term "highest" is unsupported. Why is this the highest? Why are other forms lower? If there is some commonly recognized standard that ranks levels of sociality it needs to be cited.

In addition to being unsupported, the definition appears to be stated later:

Eusociality is distinguished from all other social systems because individuals of at least one caste usually lose the ability to perform behaviors characteristic of individuals in another caste. TABLOYD (talk) 16:37, 19 January 2025 (UTC)[reply]

Thanks for asking. However, Wikipedia articles do not have introductions. Instead, they have a lead section which is solely a summary of the article body. Normally, the lead does not repeat citations, but relies on the citations of the bit of text summarized in each lead sentence. That is the case here. The statement you mention is explained at the top of 'History' and is cited to the work of Suzanne Batra which founded the concept of eusociality; she introduced the hierarchy of levels. All the best, Chiswick Chap (talk) 16:48, 19 January 2025 (UTC)[reply]