There aren’t many long-living loners in the wild.
Leopards are loners. Leopards are cool.
So maybe you want to be a leopard.
But as you get older you have no mates to help you find food or detect danger.
And so you die.
Herds and packs stay alive longer because they can rely on one another.
Hyenas might not look cool, but they live longer than leopards.
Why? Because they operate in packs.
In groups.
Nature rewards groups.