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 |