The habitats of rodents are varied and numerous, from arid (extremely dry) deserts to the arctic tundra. There are rodents that live predominantly underground, others that live on land, and others are primarily arboreal (living in trees). Some species spend most of their life in the water, while others live in the desert. Some live close to humans in urban areas and even houses, while others make their home deep inside wetlands and rainforests. Rodents can be found in almost every habitat and on every continent except Antarctica.