A team of law enforcement and wildlife specialists are currently searching for the bear, but authorities haven't decided what would be done with it if found.
In the video, the woman can be seen approaching a mother bear and two cubs to take pictures or videos. She runs off only when the mother bear charges at her.
Carl Mock died after a 410lb grizzly bear attacked him
The man was ordered by a court to pay $1,200 after pleading guilty to multiple charges—including foot travel in a thermal area and violating closures and use limits.
The footage was captured a week after a group of tourists caused another stampede by a river in Lamar Valley.
Footage of the encounter showed a large wolf pack working to force a big grizzly into a wooded area and out of their territory.
"I was able to film 2 Grizzlies fighting over the carcass early this morning. National Geographic, eat your heart out," wrote the man who filmed the encounter.
The bear chased the male elk into the Yellowstone River before killing it and dragging it to the bank.
Oscar Mayer is giving you the opportunity to request its iconic Wienermobile to come to your proposals.
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.
Presence of lake trout has impacted bald eagles, ospreys and bears, study shows.