MonsterQuest (2007)

Season 3: Episode 2

Something mysterious and violent is killing cattle of the North American plains, but what is behind these gruesome attacks: satanic cults, an unknown predator, or something previously unknown to man? Livestock are found dead, often with their blood drained and organs or body parts removed from their bodies. With no apparent footprints or tracks leading to or from the carcasses and strange circles near the site, the mystery only deepens.