Wolves, coyotes, and foxes were once abundant in Pennsylvania but were driven to extinction by human activity like habitat loss and bounty programs. Coyotes have since returned to the state and are found in all counties. They are larger than historic coyotes and believed to be coyote-wolf hybrids. Foxes were also affected by habitat changes as the gray fox's woodland habitat disappeared, allowing for the introduction and spread of the red fox. Both red and gray foxes are now found throughout the state. While wolves are still absent, efforts at conservation have allowed for their return in some parts of their historic range.