6,896 results
6,896 results for: Bears
- Animals
Polar bears provide millions of kilograms of food for other Arctic species
A new study shows how much food polar bears leave behind — and how their decline threatens scavengers across the Arctic.
- Life
How these strange cells may explain the origin of complex life
The tiny pantheon known as the Asgard archaea bear traits that hint at how plants, animals and fungi emerged on Earth.
- Planetary Science
A Mars rock analysis tool proved its mettle on a chance find from Arizona
On Mars, the Perseverance rover found a spotted rock that could bear signs of ancient life. On Earth, a researcher used a lookalike for a dry run.
- Climate
Hurricane Melissa spins into a monster storm as it bears down on Jamaica
The story of Atlantic hurricanes is treading a familiar — and frightening — path: Climate change is fueling huge, slow-moving, rain-drenching storms.
- Paleontology
Crystallized dino eggs provide a peek into the tumultuous Late Cretaceous
Definitively dating the age of a clutch of fossil dinosaur eggs at a famous site in China may let scientists link eggshell features to environmental shifts at the time.
- Health & Medicine
How a bacterial toxin linked to colon cancer messes with DNA
A closeup look at colibactin’s structure reveals chemical motifs that guide its mutation-wreaking “warheads” to specific stretches of DNA.
- Life
Horses may have become rideable with the help of a genetic mutation
To make horses rideable during domestication, people may have inadvertently targeted a mutation in horses to strengthen their backs and their balance.
- Health & Medicine
Cancer treatments may get a boost from mRNA COVID vaccines
Cancer patients who got an mRNA COVID vaccine within a few months of their immunotherapy lived longer than those who did not, health records show.
- Animals
Cuddly koalas had a brutal, blade-toothed close cousin
Ancient collagen preserved in the bones of extinct Australian mammals is revealing their evolutionary relationships, leading to some surprises.
- Animals
40,000-year-old woolly mammoth RNA offers a peek into its last moments
Ancient RNA from Yuka, a 40,000-year-old woolly mammoth preserved in permafrost, can offer new biological insights into the Ice Age animal’s life.
- Animals
What the longest woolly rhino horn tells us about the beasts’ biology
A nearly 20,000-year-old woolly rhino horn reveals the extinct herbivores lived as long as modern-day rhinos, despite harsher Ice Age conditions.
- Paleontology
Sloths once came in a dizzying array of sizes. Here’s why
A new fossil and DNA analysis traces how dozens of sloth species responded to climate shifts and humans. Just two small tree-dwelling sloths remain today.
