Bloodwing

The Bloodwing is Mordecai's pet as well as the name of his active ability. With this ability, Mordecai can send his Bloodwing out to attack an enemy and then return.

Quotes

 * "Someone's getting a treat!"
 * "Good boy!"
 * "That's my boy!"
 * "Give 'em hell, Bloodwing!"
 * "Like my pet, huh?"
 * "You looking at my bird? They looking at you Blood"

Zombie Island of Dr. Ned
There is a mission located in Jakobs Cove which involves killing zombified Bloodwings called Corpse Eaters to collect the bloodwing eggs they drop. They attack much like Rakk, and are no where near as deadly as Mordecai's bloodwing is.

Trivia

 * Bloodwings are highly sought after as exotic pets by animal trainers. Unfortunately, most Bloodwings never take a liking to humans and tend to kill their would-be trainers, making the number of trained Bloodwings extremely rare.
 * It seems that Bloodwings are an endangered species due to how Mordecai's wanted poster says "Possession of Endangered Species." The poster also offers an extra reward with "another million for that annoying bird" written in red.