"Killer of killers" is a term often used to describe a predator that preys on other predators. These animals play a crucial role in maintaining balance within ecosystems by controlling populations of mid-level predators, which in turn prevents overgrazing or over-predation on lower trophic levels. Examples include apex predators like lions preying on hyenas, orcas hunting sharks, or even certain species of snakes consuming venomous snakes. By keeping predator populations in check, "killers of killers" contribute to greater biodiversity and ecosystem stability.