Hognose

Hognose snake is a common name for several unrelated species of snakes with upturned snouts, classified in two colubrid snake families and one pseudoxyrhophiid snake family.

They include the following genera:

• Heterodon, which occur mainly in the United States and northern Mexico
• Leioheterodon, the hognose snakes native to Madagascar
• Lystrophis, the South American hognose snakes.

The North American Heterodon species are known for their habit of thanatosis: playing dead when threatened.