Someone cut off the head of a sea lion in Northern California and rode off with it in a bag. Authorities are now offering $20,000 for information that helps find the perpetrator.

An eyewitness described a suspect seen as around 30 to 40 years old, dressed in all black and riding an e-bike.

The National Oceanic and Atmospheric Administration’s Office of Law Enforcement said a witness reported seeing a person decapitate the dead animal before leaving the area.