SE Asia tropical forest region has greatest diversity of living organisms contains 20% of the planet's vertebrate and plant species and the world's third-largest tropical forest. In addition to this existing biodiversity, the region has an extraordinary rate of species discovery, with more than 2,216 new species described between 1997 and 2014 alone.
While Sahara hosts some 70 species of mammals, 90 species of resident birds, 100 species of reptiles, and numerous species of arthropods (invertebrates that have jointed limbs, segmented bodies and external skeletons)
Although rainforests and deserts are very different, they do have something in common. They both have mountains and steep canyons.
One thing all deserts have in common is that they are arid or dry. Most experts agree that a desert is an area of land that receives no more than 25 centimeters (10 inches) of precipitation a year. The amount of evaporation in a desert often greatly exceeds the annual rainfall.
A tropical forest is a type of forest found in areas with high regular rainfall and no more than two months of low rainfall, and consisting of a completely closed canopy of trees that prevents penetration of sunlight to the ground and discourages ground-cover growth.
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