Here you see a macaque exploring the possible use of something that probably was handed to him by visitors through the fence of its enclosure, a broken surgical mask. You see those being used by people in public in East Asia. The background noise level is typical and even quite low at this part of Hanoi Zoo, because most of the kids entertainment facilities, such as electrical trains and merry-go-rounds are situated in other sections of the Zoo. You wonder where the elastic bands of the mask have gone.