Humans can impact animal and plant populations. When humans develop land for houses and buildings, they cut down trees and change animal and plant habitats. Some animals like the raccoon and the skunk can adapt, but other animals can't adapt and their populations are affected.
The common loon nests on land near large lakes. Some loon nesting places have been taken over by human development and the loon population has decreased. Sometimes hunting can impact animal populations. Whale populations have been lowered because of over hunting. Pollution can also hurt animal and plant populations.