Recently, I saw a video from a study of chimpanzee cognition in which chimps were presented with a peanut inside a clear tube that was mounted to the outside of their enclosure. Within a short amount of time, the chimp began filling the tube with water so that the nut would float to the top. Genius! So, yesterday I decided to see how these guys would handle the problem and zip-tied a couple of nut-filled bottles to the outside of the caging. Clearly, my method of attaching the bottles wasn’t quite as elaborate as the one used in the study, since the chimps could just turn them over, but it did keep them busy and entertained for quite some time!