The park is named after Cerro Castillo, its highest mountain and main attraction.

[2] Mammals in the park include the endangered South Andean deer, guanacos, pumas, chingue (Molina’s hog-nosed skunk), and canines of the genus Lycalopex.

Notable birds that inhabit in the area are the Andean condor and black-chested buzzard eagles in the mountains, and austral parakeets, thorn-tailed rayaditos, Magellanic woodpeckers, churrín del sur (Magellanic tapaculo), and the chucao tapaculo.

Cerro Castillio National Park is a key part of the National Huemul Corridor, a public-private initiative that seeks to reestablish the huemul population using wildlife corridors in key conservation areas along the Route of Parks of Patagonia.

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