The pictures posted on its Public Relations Facebook page showed a monkey, civet and deer.
"These pictures show that the wildlife sanctuary officials' efforts to conduct smart patrol to prevent threats to wildlife has paid off so far," Phu Sithan wildlife sanctuary chief Komkrit Sampetcharoen said.
Phu Sithan wildlife sanctuary is located in the lower part of Phu Phan mountain, covering Kalasin and Mukdahan provinces.
As this wildlife sanctuary has abundance of forest and water resources, many wildlife, such as foxes, Malayan pangolins, Asian palm civets, flying squirrels, Sikhra sparrow hawks, Chinese pond herons, Green-billed Malkoha cuckoos, Chinese water dragon, Malayan krait snakes and dark-sided frogs, were reportedly discovered in the area.