Well, elephant mothers in a group help protect each others' young from predators by creating an impenetrable elephant wall around them. A single elephant mother

Well, elephant mothers in a group help protect each others' young from predators by creating an impenetrable elephant wall around them. A single elephant mother could not protect her own young by surrounding them in this way, but she can protect her young by joining the group, if she is also willing to help protect others' young as well. On the other hand, members of a herd are usually genetically related, so it is possible that kin selection can also explain this phenomenon.