The main species of tree is oak: it has been described as probably the best preserved Quercus robur forest in Spain.

Human access to the nature reserve itself is now strictly controlled, although there is a visitor centre overlooking it.

The area of the biosphere reserve was extended in 2003 to take account of the creation of the Natural Park of Fuentes del Narcea, Degaña e Ibias, which incorporates Muniellos.

As at 2011 there has been discussion of how the various biosphere reserves in the Cantabrian Mountains could be managed as a single super-reserve to be known as Gran Cantábrica.

There are recovery plans in operation for both of these animals as they need to extend their range within the Cantabrian mountains in order to build sustainable populations.