Kill was a giant bird with human face sent by Hades to kill Hercules. It was one of the infamous [[Wikipedia:Stymphalian birds|Stymphalian Birds].
In the animated series, another pair of Stymphalian Birds were 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 don't appear. However, one of Hercules' twelve medals represent the monsters.
- In the original myth, destroying the Stymphalian Birds was Hercules' sixth labor.