Bones from a fossil rich site at Tanque Loma in Ecuador offers clues to how a group of 22 plus giant sloths met their end 18,000 years ago.
The circle, named Kostenki 11, was about 40 feet in diameter with no obvious entrance.
The Yarrabubba impact crater in Western Australia is the oldest in the world.
The 330-foot-long structure was created with boulders from a river over a mile away.
The latest known fossils belonging to extinct human species dated to between 117,000 and 108,000 ago.
Researchers find first direct evidence of a "glacial oxygen pump," which they say extended an essential lifeline to the simple life forms that inhabited the Earth at the time.
Archaeobotanists at the University of Glasgow in Scotland have identified more than 75 species of plant frozen alongside Ötzi.
Short-faced kangaroos are an entirely extinct group of marsupial herbivores that arose during the Miocene Epoch—around 23 to 5.3 million years ago—and diversified prolifically during Australia's Ice Age.
The trees in the forest would have been about 10 feet tall and resembled palm trees.
Researchers are probing the forest to see if humans ever lived there.
The collision triggers a chemical reaction that causes carbon dioxide to be sucked from the atmosphere.
The formations were "sculpted by 320 million years of ice, wind, and the movement of entire continents," the National Trust said.
Dried meat may have offered a long-lasting source of food in a changing rainforest.
Scientists think the genetic mutation behind these teeth protected babies against an intense lack of sunlight.
A fossil skull was 20 percent bigger than even those of the largest modern lions in Africa.
The research team came to their hypothesis after analyzing rocks, lakes, and glaciers.
"This is sort of a dark archaeology, where we benefit from climate change that's making this ice melt."
New evidence reveals a previously unrecorded indigenous population and poses a major challenge to existing theories about the earliest Americans.
At the time, volcanoes in Iceland were erupting 50 times more often than today.
Western spotted skunks do handstands to make themselves appear more threatening.
Melting glaciers turning land to bog was behind widespread extinctions of animals like the giant sloth and woolly mammoth between 15,000 and 11,000 years ago.
The find refutes earlier ideas about humanity's ability to adapt to altitude.