Predator
From Tardis Wiki, the free Doctor Who reference
A predator was an animal that naturally hunted and killed beings below it within a food chain.
The Seventh Doctor identified the Stigorax as "ruthless, intelligent predators." (TV: The Happiness Patrol)
"The Predator" was the Daleks' name for the the Doctor. (TV: Asylum of the Daleks)
River Song identified the Weeping Angels as predators. (TV: The Angels Take Manhattan)
The Eleventh Doctor identified the snowmen of the Great Intelligence as "mindless predators". (TV: The Snowmen)