The hood mockingbird is mainly a scavenger that will eat the eggs of seabirds and animal carcasses killed by other predators like hawks. While they don’t injure other animals in order to draw blood, they will drink from an already wounded animal.
While different types of leeches feed in different ways, and not always from living hosts, the type of leech most people think of when you say the word “leech” is the blood-sucking leech.
The Cooper's Nutmeg attach themselves to the rays, cut through the flesh, and wiggle into the wound to start feeding.
Common vampire bats typically feast on the blood of sleeping livestock such as horses, pigs, and cattle.
Blood-sucking sea lampreys are eel-like creatures with seven gills and two dorsal fins.