Swinging
From AmtWiki
A Monster Ability. Text from Welcome To The Jungle.
Description
To simulate the act of brachiation (vine-swinging), the monster may grasp any stout tree and declare “Swinging!” The Monster may then move to any other tree within 20 feet. They may continue to do so indefinitely, so long as there are trees within 20 of another. Only missile weapons and verbal magic may be used against brachiating monsters, and then the attacker must remain at a distance of 20 feet.