[1] The native forests of Phou Xieng Thong host a large variety of animals and birds, including endangered species.

[1] Animal species include Asian black bear, Sumatran serow, banteng, pangolin, monitor lizard and leopard.

The IBA covers an area of 367 square kilometres (140 sq mi) including part of the Mekong's eastern bank.

Endangered bird species in the IBA include green peafowl, grey-headed parakeet and red-collared woodpecker.

Bird species rare within the park include red-vented barbet, eared pitta and grey-faced tit-babbler.