What does a hedgehog raccoon koala and opossum have in common?

The animals you listed - hedgehog, raccoon, koala, and opossum - are all marsupials or have marsupial-like characteristics. Here's a breakdown:

* Koala: A marsupial native to Australia, known for its cuddly appearance and eucalyptus leaf diet.

* Opossum: A marsupial found in the Americas, known for its prehensile tail and ability to play dead.

Hedgehogs and raccoons are not marsupials, but they share some characteristics with marsupials:

* Hedgehogs: While not marsupials, hedgehogs are insectivores, like many marsupials. They also share a similar "spiky" appearance with echidnas, a type of monotreme (egg-laying mammal) that is a relative of marsupials.

* Raccoons: While not marsupials, raccoons are omnivores with similar foraging behaviors to many marsupials, like scavenging and eating a variety of foods.

Therefore, while not all marsupials, they all exhibit traits or behaviors characteristic of this group of mammals.