"When will I be free?" is the title of a set of pictures by Tran Huu Vy, from Da Nang city, which he posted on his Facebook page.

Vy uploaded 101 pictures of the captive monkeys that he saw during his business trips to the central region and Central Highlands.

One monkey with an infected wound on his left leg was chained and shackled.

In 2009, during a study tour to the Chumonray National Park (Kon Tum), he and his colleagues found a monkey trapped by a rope, hanging in the air in the cold weather and high humidity. The wound at the ankle was swelling, and flies hovered over it. Vy and his colleagues released the animal to the forest.

Another time, during a business trip to the Bo Y border gate (Kon Tum), he saw an old red-faced monkey, which had been caught by a trap and was in captivity at a local household.

"I convinced them to clean the wound of the monkey to avoid infection and advised them to release it to nature," he said.

Working for decades in the field of protection of wildlife, Vy has witnessed hundreds of monkeys in captivity, even being slaughtered.

A monkey with a wound on his arm, caused by the trap. 

Most of the monkeys in captivity are listed as endangered species.

Vy published the pictures with the goal of raising public awareness about wildlife protection.

In related news, the Director of the Nuoc Viet Xanh (Green Vietnam) Center for Biodiversity Conservation said the center will establish a society of monkey lovers to exchange information on conservation of biodiversity.