Re Stilly's thinking chimp:

Long ago (ca. 1952) the Wichita zoo, such as it was, had a lion who would periodically decide to "perform." His act was quite carefully and deliberately planned.

He would start by pacing back and forth for a bit, then would commence "roaring" and faster pacing.

When a sufficient audience had rushed to his cage to see what the commotion was all about, he would "frolic" for a bit to give them a bit of a show, then charge the front bars of his cage and P*SS on the audience.

It was quite likely a protest against the lack of proper toilet facilities, but so far as I know the zoo never provided him a "non-splash" facility.

John