so I am really bored at work 🙂 and happy to help you out
I found it online
An altruisticBEHAVIOR is one in which an individual (the donor) performs an action that helps another animal (the recipient) with no apparent advantage to itself. Natural selection should eliminate such behaviors, yet there are many examples (alarm calling in squirrels, helpers at the nest in scrub jays, sterile worker castes in honey bees etc.)
Kin selection is the evolutionary mechanism that selects for those behaviors that increase the inclusive fitness of the donor. 😀