Mongooses have a fair society because moms care for all pups as their own (psychnewsdaily.com)

The study [0] finds that because mongooses don't know which offspring belong to which moms, all the pups are given equal access to food and care - brilliant example of ignorance promoting fairness in a mammal society.

[0] https://www.nature.com/articles/s41467-021-23910-6