Which terrestrial vertebrate group is extremely rare in deserts?
Amphibians are terrestrial vertebrates extremely rare in desert environments (although there are a few species adapted to this type of ecosystem). Amphibians are rare in deserts because they do not have a permeable skin and so they easily lose water by evaporation and desiccate. They also need an aquatic environment to reproduce, since their fecundation is external and their larva is water-dependent.
