Washington State Fish and Wildlife Police confer with an individual from the King County medical examiner's office and a King County sheriff's deputy on a remote gravel road above Snoqualmie, Washington, following a fatal cougar attack on Saturday. One man was killed and another seriously injured when they encountered a cougar Saturday while mountain biking in Washington state, officials said. Credit: Alan Berner | The Seattle Times | AP

A cougar killed one man and seriously injured another in a rare attack Saturday in rural Washington state, authorities said.

The two men, in their 30s, were mountain biking near North Bend, a foothills town about 30 miles from Seattle, about 11 a.m. when they realized a cougar was chasing them. Capt. Alan Myers, of the Washington Department of Fish and Wildlife Police, told KIRO that the men made loud noises — something that authorities recommend people do during such encounters to drive the animals away. But as the bikers were catching their breath, the cougar lunged at one of them and latched on to his head.

“He said he had his whole entire head in the jaws of this animal and was being shaken around very, very horribly,” Myers said.

That man managed to escape, only to find his friend being chased by the cougar. The other man dropped his bike, ran into the woods and was later killed, Myers told KIRO.

Myers said the attack and the animal’s behavior are rare.

“The fact that it stayed in close proximity to these folks and attacked and stayed with them is highly, highly unusual,” he said.

Before Saturday, just 16 cougar attacks, one of which was fatal, had been reported in Washington state in the past century. The first known fatal attack happened in the 1920s, when a boy named Jimmy Fehlhaber was devoured by a male cougar.

Roughly 120 attacks, 25 of which were fatal, have been reported in the United States and Canada in the past 100 years.

However, attacks involving cougars, also known as mountain lions, have been increasingly common in the past 20 years as humans encroach on wildlife habitats. In Washington state, for example, seven of all reported attacks occurred during the 1990s.

Washington Department of Fish and Wildlife Police has euthanized the cougar, a 100-pound male about 3 to 4 years old. The surviving victim is at Harborview Medical Center in Seattle, where his condition was upgraded to satisfactory on Saturday, according to media reports.

According to the Washington Department of Fish and Wildlife, 1- to 2-year-old cougars that have become independent of their mothers are more likely to attack domestic animals and humans.

“When these young animals, particularly males, leave home to search for territory of their own, and encounter territory already occupied by an older male cougar, the older will drive off the younger one, killing it if it resists. Some young cougars are driven across miles of countryside in search of unoccupied territory,” the agency said.

If you encounter a cougar, don’t run — because the animal’s instinct is to chase. Instead, authorities advise people to never take their eyes off the animal and to try to appear larger and more intimidating. Shout, wave your arms and throw rocks, anything to let the animal know you are a threat and not prey.

“If the cougar attacks, fight back aggressively and try to stay on your feet,” according to the Washington Department of Fish and Wildlife. “Cougars have been driven away by people who fought back.”

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