The species considered rare included pig-tailed monkeys and four-eyed and big-headed turtles, Nguyen Danh Ky, director of that ecological reserve, told Vietnam Plus.

An Indian python, a monocled cobra and two king cobras also returned to nature, the source stated.

The operation was conducted by specialists from Vu Quang National Park and Cuc Phuong National Protected Area, located in the northern town of Ninh Binh.

As a next step, experts will continue to monitor those animals to ensure their protection, Danh Ky said.

Recently, nearly 200 animals saved from captivity in several operations were released back to nature at Phong Nha-Ke Bang National Park, in the central province of Quang Binh.

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