Killer's work is sorely needed. While the number of African rhinoceroses currently living in Kruger National Park is up for debate (estimates range from 1,500 to 10,500), it's certainly not getting any larger. Poachers, who target rhinos for their high-value horns, kill hundreds per year. In 2014, poachers in South Africa killed 631 rhinos in an eight-month period alone - 408 of whom were killed in Kruger National Park.
Killer's award is from the People's Dispensary for Sick Animals (PDSA), a veterinary charity that funds medical care for sick animals across the U.K. Since it was founded in 1917, the organization has given out only 24 awards. Killer is heroic number 25.