Yellowstone national park

The 37-year-old woman had been hiking on the Fairy Falls Trail near Old Faithful on Monday when she came across two grizzly bears.

The bear attacking the juvenile bison was filmed by local business owner Michael Daus.

The Idaho earthquake was the biggest since the Borah Peak earthquake in 1983.

The National Park Service is preparing for the presence of bears by closing off certain sections of the park.

Park officials said a 43-year-old woman was treated her for puncture wounds and lacerated to her head and arm and the coyote was killed and is being tested for rabies.

Analysis suggests Steamboat has a "more complex and deeper" plumbing system than Old Faithful.

"They develop this lifelong outlook that people just aren't a big deal," said senior Yellowstone wolf biologist Doug Smith.

Impact of bison grazing on the national park is so extensive it can be seen from space.

"I saw that alpha females are the true leaders of the pack, not the big alpha males. Wolves have a matriarchal society and males seem to totally accept that, " expert Rick McIntyre said.

Joshua Mjoness of North Dakota was arrested after sending messages to his wife threatening a shooting at a Boise, Idaho office.

"We often hear about the potential for large volcanic eruptions of the Yellowstone volcano. However, we rarely focus on the threat of large earthquakes in the region," researcher Jamie Farrell said.

The encounter is just the latest example of Yellowstone visitors placing themselves and others in danger by getting too close to bison in the park.

Bison have injured more people in Yellowstone than any other animal, according to the National Park Service.

Steamboat is the world's tallest currently active geyser, capable of shooting jets of boiling hot water more than 300 feet into the air.

Wyoming Board of Geographic Names voted to change name of Mount Doane to the First Peoples Mountain.

Aquatic invasive species pose a grave and growing threat to the Yellowstone ecosystem.

Study of how elk responded to wolves shows there was little change to their movements around National Park.

Presence of lake trout has impacted bald eagles, ospreys and bears, study shows.

The activity does not mean a volcanic eruption is imminent.

Oregon man committed a string of crimes while going on drunken bender through national parks.

Raymond Reinke is accused of going on a crime spree while travelling to multiple national parks.

Learning to interact with wildlife is not a part of the standard curriculum at most schools.

"The first thing that comes to my mind when I think back on it was just how loud it was, the roar of the eruption."

The woman sustained serious injuries after the elk appeared to try to protect its calf.

Steamboat Geyser is capable of shooting jets of water up to 300 feet into the air.

Scientists think they've found the magma behind the volcano's incredible eruptions.

"We have zero concerns that anything is happening volcanically."

The researchers found the virus lurking in a bucket of water.

"Yellowstone is just a very swarmy place."

"Man, the changes would be so much bigger than anything we've ever seen."