Kill was a giant bird with a human face sent by Hades to kill Hercules. It was one of the infamous Stymphalian Birds.
In the animated series, another pair of Stymphalian Birds are used by Pain and Panic to cause Hercules to lose control of Apollo's Sun-pulling cart. These birds can breathe fire fierce enough to cut the divine chains of Apollo's cart.
- In Once Upon a Time, the Stymphalian Birds do not appear. However, one of Hercules' twelve medals represent the monsters.
- In the original myth, destroying the Stymphalian Birds was Hercules' sixth labor.