Marine Lance Cpl. Lance with 1st Battalion, 5th Marine Regiment, drinks the blood of a king cobra as part of jungle survival training during exercise Cobra Gold 2020 at Ban Chan Khrem, Chanthaburi, Thailand on March 1. U.S. Army Photo by Sgt. Nicolas Cholula

People for the Ethical Treatment of Animals has demanded the Marine Corps stop allowing a bunch of "giddy Marines" to cut off the heads of cobras and drink their blood during the annual Cobra Gold military exercise in Thailand, according to a letter sent Tuesday to the Commandant of the Marine Corps.

The letter written by PETA Vice President Shalin Gala urged the Corps to use ethical non-animal training methods and "end the use of live animals in food procurement survival exercises."

Citing a report in The Daily Mail, PETA said Marines during the exercise had killed chickens with their bare hands, skinned and ate live geckos, decapitated cobras and drank their blood, and ate live scorpions and tarantulas. The animals are killed during jungle survival training put on by Thai military personnel.

"Food procurement survival training options that don’t use any animals are widely available," Gala wrote.

Royal Thai Marine Petty Officer 1st Class Pairoj Prasarnsa, Chief Jungle Survival Trainer with Marine Recon Patrol, tames a king cobra during jungle survival training alongside his U.S. Marine counterparts during exercise Cobra Gold 2020 in Ban Chan Khrem, Chanthaburi, Thailand on March 1. U.S. Army Photo by Sgt. Nicolas Cholula

Though photos posted online showed Marines with 1st Battalion, 5th Marine Regiment drinking cobra blood — an alternative way to stay hydrated while in the jungle — many military units take part in this same activity year after year during Cobra Gold, a multinational 10-day exercise in Thailand that features live fire drills and survival training.

"The photos showing giddy Marines swallowing scorpions and guzzling cobra blood are more reminiscent of a frat party gone wrong than a military drill," PETA Vice President Shalin Gala said in a statement.

"PETA is calling on the Marine Corps to take immediate action to replace this barbaric exploitation of animals with cutting-edge, technology-based survival training courses that will better prepare troops."

A spokesman for Gen. Berger declined to comment.

You can read the full letter from PETA here.