A faulty mechanism allowed two orangutans to escape their zoo enclosure on Monday, but only one survived.
One of the two apes had climbed out of his confines and was about to scale the exterior wall leading off the property, according to a statement from the Duisburg Zoo. But, before he could complete his escape, the zoo made a decision to kill the orangutan.
Tranquilizers wouldn't have slowed down the 26-year-old ape fast enough, according to the statement. The zoo claimed the orangutan could have accessed the road outside the zoo and become a risk to human lives during the time it would take the tranquilizer to kick in.