In jungles, there are many pressures for survival. The most important of which is finding of food and water. Humans have managed to domesticate animals, farm for food crops, vegetables and fruits and harness rivers to provide water. Thus, humans have very little limitations in terms of food and water. Further, humans have access to medical care to cure diseases that may kill animals in the jungle. As a result, human population increases much more quickly than the population of animals living in jungles.