A cheeky orangutan made it clear what he thought of these visitors to a Washington, D.C. zoo: by taking a massive dump on their heads. <br /><br />The incident happened at National Zoological Park where the orangutans are usually kept indoors.<br /><br />But, according to the filmer, the animals are allowed at certain times to roam free across ropes above a pedestrian walkway.<br /><br />"We wondered why there was a yellow caution box painted underneath the ropes. We know now!" says Joanne, the filmer.<br /><br />The footage was captured last month.<br /><br />++CLIENTS PLEASE NOTE: THIS VIDEO HAS BEEN EDITED++
