There are many species of wild animals that share the Milwaukee habitat with humans. They have adapted well to the urban environment evading contact with peope. However, humans are drawn to wild animals and many keep them as pets.
Wild animals are not pets and do not make good pets. Unlike domesticated animals who have been living with humans for millennia wild animals maintain their basic survival traits. Those people who have chosen to keep wild animals have modified the term to exotic. This does not mean that the animals are domesticated.
Wild or exotic animals need special care and do not adapt well as pets. Primates like monkeys and chimpanzees have been favorite exotic pets for decades but when they reach adulthood they become territorial and aggressive. In other words they urinate to mark their territory and they bite, not acceptable behavior in the home.
Rescued wild animals carry diseases like rabies, herpes B virus and salmonella. Injured animals become very defensive. One bite and a human can be infected.
Exotic animals are usually bred under less than ideal situations and are not scrutinized by animal protection agencies. Many of these animals have been imported to the United States leaving their natural habitat populations in distress and some on the brink of extinction.
Wild is best left wild. It takes centuries to domesticate an animal. With the dog and cat populations in the Milwaukee area exploding there is no reason to turn to a wild animal for a pet.