Capuchin monkeys are trying to escape their enclosure at Colchester Zoo

Some of the critically endangered buff-headed capuchins have accepted their fate as inmates at Colchester Zoo. While others apparently have not and try to break out, using tools to find the hidden latch to unlock and open the window. See them peering out and being alert. Nonetheless, they are completely preoccupied with their mischievous act, and do not notice the lady who tries to attract their attention by knocking on the glass.