WATCH: Amazing footage of chimpanzees escaping their enclosure in Belfast Zoo

We're pretty sure this is how Planet of the Apes started.

Chimpanzees are famously pretty clever fellas. We like to think we're smarter than they are, but the chances are that they could outsmart us in plenty of situations. That's what happened in Belfast Zoo on Saturday, when the zoo's chimps finally worked out how to escape their enclosure and then spent a while roaming the zoo at large. Footage captured by the zoo shows the chimpanzees using branches that fell during Storm Erik to climb up over the wall of their enclosure. https://twitter.com/stuartrobinson1/status/1094354164145111042 Other video shows the chimps freely roaming about the zoo: https://twitter.com/stuartrobinson1/status/1094324275077701632 It has since been confirmed that all of the chimps are accounted for and back in the enclosure. Which is a little bit sad, if you ask us.