This prompted the Peruvian government to reserve an area that would serve as a nature sanctuary, by creating the Oso Perdido National Forest.

[3] In 1977, a lumber company, El Chaupe, was granted two exploitation contracts by the government in the forests located in the districts of Chirinos, Tabaconas and Namballe, all in the province of San Ignacio.

However, it was only in 1987 that some government institutions along with La Molina University carried out the studies for the establishment of a spectacled bear sanctuary in the area.

[4] Montane forests in the sanctuary include species from genera: Podocarpus, Miconia, Weinmannia, Clusia, Cyathea, Dicksonia, Wettinia, Alchornea, Hedyosmum, Ficus, Chusquea, Inga, Guarea, etc.

[4] Mammals reported in the sanctuary include: the montane guinea pig, the mountain tapir, the spectacled bear, the puma, the white-tailed deer, the grey-bellied shrew opossum, Taczanowski's Oldfield mouse, the hairy yellow-shouldered bat, Thomas's broad-nosed bat, the Venezuelan red howler, the lowland paca, the nine-banded armadillo, etc.

[4] 13 species of amphibians are present in the sanctuary, including: Lynchius parkeri, Pristimantis galdi and Osteocephalus sp.