Its kill or be killed

In the forest of the table-land a mile back from the ocean old Kerchak the Ape was on a rampage of rage among his people.

The younger and lighter members of his tribe scampered to the higher branches of the great trees to escape his wrath; risking their lives upon branches that scarce supported their weight rather than face old Kerchak in one of his fits of uncontrolled anger.
-Tarzan of the Apes

by Edgar Rice Burroughs