The man, whose name was not released, had sustained "serious injuries" and was transported to a local hospital, said Alachua County Fire Rescue Deputy Chief Jeff Taylor in an email.
"It looks like it was accidental".
The cassowary, which is native to New Guinea and Australia, is considered the most risky bird in the world with dagger-like claws up to 4 inches in length that can "slice open any predator or potential threat with a single swift kick", the San Diego Zoo said on its website, adding that it is also the second heaviest bird on the planet topping out at 167 pounds.
"The cassowary is rightfully considered the most unsafe bird in the world!" the zoo says.
The county sheriff's office identified the victim as Marvin Hajos, 75, and said an investigation into his death had been opened. "When he fell, he was attacked", Taylor said.
A Florida man who authorities believe was breeding cassowaries has been killed by one of the birds.
Chief: Boy thrown from Mall of America balcony being treated
Brian Johnson had just entered the mall when he saw the crowds of people gathered near the escalator and the boy on the ground. Potts said the Mall of America will often give a no-trespass order to offenders, with a time limit appropriate to the crime.
Cassowaries are eaten in parts of New Guinea. He is known as an experienced breeder and is said to have kept other kinds of exotic animals for decades.
They confirmed that the cassowary was still located in the building.
"The cassowary involved remains secured on private property at this time", he said.
Cassowaries can grow up to 6ft in height and weigh around 60kg and are broadly similar to emus.
'The cassowary can slice open any predator or potential threat with a single swift kick.
Although they are usually thought of as shy and reclusive, like any animal, they can become violent when they feel threatened or cornered. On Friday, April 12, 2019, a cassowary, a large, flightless bird native to Australia and New Guinea, killed its owner when it attacked him after he fell on his property near Gainesville, Fla.
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