Radstag

Radstags are creatures that live in Appalachia, the Commonwealth and the Island.

Biology
 This creature drops radstag meat and a radstag hide on death. They are dicephalic, or two-headed; each head is able to swivel and turn on its own. Radstags also have two underdeveloped legs hanging limply from their chest. 

Observant radstag
The radstag sometimes appears in Follow the Trail random encounter and leads you to a small amount of treasure.

Appearances
Radstags appear in Fallout 4 its add-on Far Harbor and Fallout 76.