Question

Why does the population of animals living in jungles not increase as quickly as the humans

Answer 1

because the animals were hunted by them as well as humans for their use.
hope it's the required answer...

Answer 2

Because we human constantly put presure on other animal species whether its about land or food we are the biggest competition they ever felt.

Secondly,there is natural balance between all animals. One animal feeds on other and thus ecological balance is maintained. But same can't be said about humans as we doesnot face such threats in our cities,town,etc so our population rapidly increasing.

And the worst of all animals are being poached. Almost most of the animal species are under the threat of extinction.