Excerpt from Mammals of the La Selva-Braulio Carrillo Complex, Costa Rica Tropical rain forests are the richest and most complex land biotas. Unfortunate ly, worldwide, more than half of what was formerly tropical rain forest has been destroyed by modern humans, ' and the rate of deforestation is increasing. Destruo tion of tropical forests is causing the extinction of thousands of species, many of them still unknown to science. Worldwide,...