Path of the Monkey is a Ranger Utility power available at the 2nd level.
Path of the Monkey
Ranger Utility 2
You and your companion take to the trees as if born there.
Daily ✦ beast, martial
Personal
Prerequisite: You must have a simian beast companion
Effect: Until the end of the encounter or until your beast companion is killed or becomes unconscious, you gain a climb speed equal to your speed, and a +4 power bonus on Acrobatics checks.