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A pet deer has gored a man to death and seriously injured his wife in a rare attack in Australia, police say.

The man, 47, had gone to feed the stag on his property in Victoria when the attack happened on Wednesday morning.

The woman suffered life-threatening injuries after going to her husband's aid, local media said. She was flown to hospital for treatment.

A recent study into all deaths caused by animals in Australia between 2000 and 2013 found none had involved deer.

Study author Dr Ronelle Welton told the ´óÏó´«Ã½ that she was not aware of any deer attacks featuring in Australian coroner's records.

Police said they had euthanised the deer at the scene near Wangaratta, about 250km (155 miles) north-east of Melbourne.

Local media said that the injured woman was helped from the deer's pen by her teenage son. The family had had the animal for about six years, it was reported.

The stag was a cross between a red deer and an elk, police sergeant Paul Pursell told reporters. Sambar, fallow, red and hog deer are all found in Victoria.

State authorities have recently warned that numbers of feral deer have increased to more than one million.

A government report last year noted that wild deer had been responsible for road collisions and infrastructure damage.

"Deer sightings and reports of public safety risk are becoming more common," the report said.

Parks Victoria classifies deer - which are not native to Australia - as a threat to vegetation in national parks.