Jungles

noun

1. A large, undeveloped, humid forest, especially in a tropical region, that is home to many wild plants and animals; a tropical rainforest.
2. Any uncultivated tract of forest or scrub habitat.
3. A place where people behave ruthlessly, unconstrained by law or morality.

   "It’s a jungle out there."

4. An area where hobos camp together.
5. A migrant camp.