When choosing more attractive guys, girl guppies with larger brains have an advantage over their smaller-brained counterparts. But there’s a cost to such brainpower, and that might help explain one of the persistent mysteries of sex appeal, researchers report March 22 in Science Advances.
One sex often shows a strong preference for some trait in the other, whether it’s a longer fish fin...
The standard dinosaur family tree may soon be just a relic.
After examining more than 400 anatomical traits, scientists have proposed a radical reshuffling of the major dinosaur groups. The rewrite, reported in the March 23 Nature, upsets century-old ideas about dinosaur evolution. It lends support to the accepted idea that the earliest dinosaurs were smallish, two-legged creatures. But...
View slideshow of other winners
This rainbow pinwheel of mouse placentas isn’t just an eye-catching, award-winning image. The differences in color also provide researchers with new clues to how a mother’s immune system may affect her or her baby’s health during pregnancy. The work could lead to earlier diagnosis and treatment of preeclampsia, a common pregnancy complication.
Aside from being adorable, sea otters and Indo-Pacific bottlenose dolphins share an ecological feat: Both species use tools. Otters crack open snails with rocks, and dolphins carry cone-shaped sponges to protect their snouts while scavenging for rock dwelling fish.
Researchers have linked tool use in dolphins to a set of differences in mitochondrial DNA — which passes from mother to...
Reviews & Previews
The ZooIsobel CharmanPegasus$27.95
When Tommy the chimpanzee first came to London’s zoo in the fall of 1835, he was dressed in an old white shirt.
Keepers gave him a new frock and a sailor hat and set him up in a cozy spot in the kitchen to weather the winter. Visitors flocked to get a look at the little ape roaming around the keepers’ lodge, curled up in the cook’s lap or tugging...
It’s not the size of a snake’s muscles that matter, but how it uses them. King snakes can defeat larger snakes in a wrestling match to the death because of how they coil around their prey, researchers report March 15 in the Journal of Experimental Biology.
King snakes wrap around their food and squeeze with about twice as much pressure as rat snakes do, says David Penning, a functional...
Large, detachable scales make a newly discovered species of gecko a tough catch. When a predator grabs hold, Madagascar’s Geckolepis megalepis strips down and slips away, looking more like slimy pink Silly Putty than a rugged lizard.
All species of Geckolepis geckos have tear-off scales that regrow within a few weeks, but G. megalepis boasts the largest. Some of its scales reach nearly 6...
Parasites can drive their hosts to do weird, dumb things. But in certain oak trees, the parasites themselves get played.
“Creepy and awesome,” says Kelly Weinersmith of Rice University in Houston, who has helped reveal a Russian doll of nested parasitisms.
The saga begins when two majestic live oak species in the southeastern United States send out new shoots, and female crypt gall...
Some bedbugs are better climbers than others, and the bloodsuckers’ climbing prowess has practical implications.
To detect and monitor bedbugs, people use an array of strategies from DIY setups to dogs. Pitfall traps, which rely on smooth inner walls to prevent escape, are highly effective for detecting and monitoring an infestation. The traps are sold around the world, but they have...
Catch sight of someone scratching and out of nowhere comes an itch, too. Now, it turns out mice suffer the same strange phenomenon.
Tests with mice that watched itchy neighbors, or even just videos of scratching mice, provide the first clear evidence of contagious scratching spreading mouse-to-mouse, says neuroscientist Zhou-Feng Chen of Washington University School of Medicine in St....