What do wolves die from?
The natural causes of wolf mortality are primarily starvation, which kills mostly pups, and death from other wolves because of territory fights. Diseases such as mange, canine parvovirus and distemper can be killers both in small and recovering populations and in some established populations as well. Evidence suggests, however, that large wolf populations build up a resistance to canine parvovirus. Lyme disease also infects wolves, and heartworm can reduce a wolf’s endurance by restricting blood flow to the lungs. Injuries caused by prey result in some deaths. The large mammals that wolves hunt and kill can inflict mortal injuries with antlers and hooves. Human-caused mortality including legal (hunting and trapping in some locales) and illegal (poaching) activities can be high in some populations. Wolves are sometimes hit by cars in areas where road density is high. Pup mortality rates are highly variable, but approximately 40 to 60% of wolf pups die each year.
