Carrion feeders attracted to the carcasses are then also killed. It feeds on a wide variety of carrion including sheep carcasses and dead game birds. They pluck maggots from carcasses and manure. They were also observed feeding on carcasses of run down animals. Fishers have been seen to feed on deer carcasses. The vultures consume about 70% of the wildebeest carcasses available. During daylight hours, they watch vultures descending upon carcasses. Wolves may kill and eat red foxes in disputes over carcasses. Vultures, drawn by the carcasses, attack the wounded man. They use poison on carcasses to kill carnivores. Red foxes may compete with striped hyenas on large carcasses. Testing methods are available for both individual carcasses and monitoring of the herds. It is suspected that they died after eating the poisoned carcasses of 3 elephants. Sodium or potassium hydroxide can be used to digest tissues of animal carcasses. Some estimates are that only 2% of the carcasses of killed mammals have been recovered.