How did Animals Evolve to Live in Colonies?

Animals will often fight in order to pass on their genes but there is one exception to this rule, animals that live in colonies. These animals usually have one mother that they aid in their reproductive success. So why do they function so differently to almost any other creatures in nature.

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Sources:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3279739/
https://pubmed.ncbi.nlm.nih.gov/24268409/
https://books.google.co.uk/books?id=2VwSDAAAQBAJ&pg=PA471&lpg=PA471&dq=Wenseleers,+T.;+Ratnieks,+F.+(2006).+%22Kin+selection+is+the+key+to+altruism%22.+Trends+in+Ecology+%26+Evolution.+21+(2):+57%E2%80%9360.&source=bl&ots=1VjUW-fzje&sig=ACfU3U36Vz2NnQMZ4cAqfaEA2wWdAvgJRw&hl=en&sa=X&ved=2ahUKEwjDi6aOm8LpAhUMThUIHX2xAAYQ6AEwAnoECAcQAQ#v=onepage&q=Wenseleers%2C%20T.%3B%20Ratnieks%2C%20F.%20(2006).%20%22Kin%20selection%20is%20the%20key%20to%20altruism%22.%20Trends%20in%20Ecology%20%26%20Evolution.%2021%20(2)%3A%2057%E2%80%9360.&f=false

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