E. amurensis E. concolor E. europaeus E. roumanicus Erinaceus is a genus of hedgehog from the family of Erinaceidae.

The range is all across Europe, throughout the Middle East, parts of Russia, and extending to northern China and Korea.

They contain hollow air filled gaps separated by thin inner layers of the spine to lessen the weight load.

The action is done because of excess loose skin on the back of hedgehogs allows them to pull it around the rest of their body forming a ball.

Once this is done a muscle that runs along the edges of the animal called the panniculus carnosus contracts pulling everything in like a drawstring.

In particular Erinaceus europaeus the body temperature can drop down to 1 °C and lower its heart rate down to 22 beats per minute.

Some species show resistance to snake venom up to forty times greater than that of the ordinary laboratory mouse.