A 9-month-old sea lion at a Tacoma aquarium performs intricate rhythmic gymnastics-esque circles with an artificial kelp strip.

The suspect was seen using an 8-inch black knife to remove the sea lion’s head, placing it in a clear plastic bag, and riding away, authorities said.

Federal investigators with the National Oceanic and Atmospheric Administration are offering a reward of up to $20,000 for information leading to the arrest and prosecution of a person seen decapitating a sea lion on Christmas Day last year.

The National Oceanic and Atmospheric Administration is offering up to $20,000 for information that leads to the arrest of a man who was allegedly seen decapiting a California sea lion.