3,466 results
- Animals
Male mammals aren’t always bigger than females
In a study of over 400 mammal species, less than half have males that are, on average, heavier than females, undermining a long-standing assumption.
- Health & Medicine
Bird flu has infected a person after spreading to cows. Here’s what to know
H5N1 has wreaked havoc on birds around the globe and occasionally made the jump to mammals, including cows. The risk to people remains low.
- Animals
These bats are the only mammals known to mate more like birds
Male serotine bats have penises too large for penetration. To mate, the animals rub their genitals against each other, somewhat like birds’ cloacal kiss.
- Animals
The first embryos from a mammal have now been grown in space
Mouse embryos in space can develop into clusters of cells called blastocysts. The result is a step toward understanding how human embryos will fare.
- Animals
50 years ago, the U.S. Navy enlisted sea lions and other marine mammals
Today, dolphins and sea lions in the U.S. Navy Marine Mammal Program protect harbors and participate in research on animal health and well-being.
- Animals
A new species of hedgehog stands out for its short spikes
At first, the eastern forest hedgehog was mistaken for its cousin. Dental and DNA analyses eventually confirmed the critter is a species new to science.
- Life
This is the first egg-laying amphibian found to feed its babies ‘milk’
Similar to mammals, these ringed caecilians make a nutrient-rich milk-like fluid to feed their mewling hatchlings up to six times a day.
- Microbes
Bird flu viruses may pack tools that help them infect human cells
Bringing along their own ANP32 proteins may give avian flu viruses a jump-start on copying themselves to adapt to and infect humans and other animals.
- Animals
The world’s highest-dwelling mammal isn’t the only rodent at extreme elevation
After discovering a mouse living nearly 7,000 meters above sea level, scientists scoured other extreme environments to make sure the find wasn’t a fluke.
- Animals
Migratory fish species are in drastic decline, a new UN report details
The most comprehensive tally of how migrating animals are faring looks at more than 1,000 land and aquatic species and aims to find ways to protect them.
- Animals
A bird flu outbreak is sweeping the globe. Its long-term effects are unclear
A reporter’s recent trip to the Galápagos offered a chance to reflect on the bird flu outbreak, which has killed millions of birds and other animals.
- Animals
Fish beware: Bottlenosed dolphins may be able to pick up your heartbeat
Fish, sharks and platypuses are adept at sensing electrical signals living things give off. Bottlenosed dolphins make that list too, studies suggests.
