Ratio between number of species of birds and mammals in tropical regions and temperate regions

Value 2 Unitless
Organism Biosphere
Reference May RM. How Many Species Are There on Earth? Science. 1988 Sep 16 241(4872):1441-1449PubMed ID17790039
Comments For the species of mammals, birds, and other larger animals that are relatively well enumerated, there are roughly twice as many species in tropical regions as in temperate ones.
Entered by Uri M
ID 103929