The exhibit floor was slowly flooded with water to see if the monkeys would become more arboreal. At first the monkeys skirted the edges, but as the water advanced, they began playing in and using it in different ways.  Two of them discovered how to make the end of the hose squirt water by putting their fingers over it. Some would swing through the exhibit on the ropes with their feet dangling in the water.

While over or in the water they kept either a hand or tail firmly attached to a rope, branch or part of the fencing. 

Although most of the monkeys did not use the water purely for play, it certainly elicited a number of different activities including watching it, drinking it, dunking monkey biscuits, reaching in it for food and hand washing. 

Importantly, it increased the overall activity of the monkeys, who instead of spending time sitting or lying on the ground, had to step over the hose, walk along the dry rim, and eventually move up to the higher fencing,  hammocks, ropes, and tree branches