On the several parallel `` sierras '' or mountain ranges running along the center of Chiapas , climate can be quite temperate and foggy . This allows the development of cloud forests like those of the Reserva de la Biosfera el Triunfo , home to a handful of quetzals and horned guans . On the several parallel `` sierras '' or mountain ranges running along the center of Chiapas , climate can be quite temperate and foggy , allowing the development of cloud forests like those of the Reserva de la Biosfera el Triunfo , home to a handful of Resplendent Quetzals and Horned Guans .