Although lizards mostly scurry on all fours, certain species can run on two legs when the mood strikes. What’s the benefit to this human-like running style? For one thing, it seems to let lizards get over obstacles without slowing down. They just have to make sure not to tip over.
Georgia Southern University biologist Lance McBrayer and graduate student Seth Parker studied running in a handsome little reptile called Sceloporus woodi, or the Florida scrub lizard. McBrayer says there’s been a lot of research into lizard species that always run on two feet. But lizards that switch between a two- and four-legged stance while running are more mysterious. Read More
Between 1993 and 2015, cattle killed 13 people who were out for walks in the United Kingdom. Dozens more walkers received broken bones or other injuries from the animals.
Murderous cattle are an understudied phenomenon, say veterinarian Angharad Fraser-Williams and other researchers at the University of Liverpool in the United Kingdom. So they scoured news articles and scientific literature to learn about cattle attacks over two decades. They turned up some advice for people wishing to avoid a fight with a bovine. First: don’t try to save your dog. Read More
Think about the last time you stood squinting in front of a full-length mirror, trying to decide whether the colors in your outfit went together. Now imagine you’re a reptile, and you wouldn’t even understand a mirror if you saw one, but somehow you need to find a rock that matches your skin color. Otherwise you might get eaten by a bird today. Oh, and the skin color you need to match is on your back.
Certain lizards in Greece manage to pull this off every day, though how they do it is a mystery. Read More
No one would argue that tardigrades got stiffed in the weirdness department. These teensy animals, also called water bears, look roly-poly under a microscope. Less than a millimeter long, they can survive extremes of heat, cold, pressure, and radiation that are deadly to most other lifeforms. Under duress, a tardigrade may curl itself into a dried-up ball called a tun, then stay in a state of suspended animation for years before returning to life. Now, researchers poring over the animal’s genes have found another oddity. The tardigrade, they say, is essentially one giant head.
Frank Smith, who’s a postdoc in Bob Goldstein’s lab at the University of North Carolina, Chapel Hill, and their colleagues studied the evolution of tardigrades by looking at their genes. Specifically, they looked at bits of DNA called “Hox genes.” These are master controllers that organize an animal’s body. During development, Hox genes make sure all the parts end up where they’re supposed to be. Mutations in Hox genes can cause unsettling problems like, say, legs growing out of the head. Read More
Could you walk in a perfectly straight line while blindfolded? It’s lucky this skill isn’t demanded often, because people aren’t very good at it. Most veer a little to one side. And the direction you err in may be tied to your personality. People with more anxious personalities, for example, tend to drift left. The insight could help scientists learn where these personality traits reside in the brain. Read More
No matter how unhip you feel wearing waders or hauling a butterfly net, citizen science is cool. That’s obvious from the boom in online projects that let you count penguins, hunt planets, or identify animals in the Serengeti, as well as the scientific papers using these data. Now researchers in Sweden have looked into the science of citizen science itself. How much of this volunteer research is really happening, they asked—and what is it producing? Read More
You’re creating a profile for an online dating site when you come to a question you’re not sure you want to answer—say, “Do you smoke?” You might be more comfortable leaving it blank than sharing the truth with all your potential dates. But a series of experiments says that we tend to judge people harshly when they withhold personal information. Even someone who shares an unpleasant truth is more appealing, trustworthy, and hirable than someone who’d rather not say.
Harvard Business School professor Leslie John and her colleagues designed the study to find out whether nondisclosure has costs. When people comfortably share so many personal details on social media, are non-sharers deemed less trustworthy? (Being Bostonians, the authors cite Tom Brady as an example—specifically, certain “insinuations” about the quarterback when he refused to hand over his email and phone records during last year’s Deflategate scandal.) Read More
Humans aren’t the only animals who know when something’s the matter. The chirps of a stressed-out zebra finch may make his mate feel stressed too—even when she can’t see him. It’s a hint that a kind of empathy exists in birds.
Zebra finches (Taeniopygia guttata) mate for life. They work together to find food, guard their nests, and raise their young. When they’re apart, they call to each other to check in.
Emilie Perez, a researcher at the University of Saint-Etienne in France, and her colleagues found in 2012 that the calls of stressed-out male zebra finches sound slightly different than usual. Not unlike a frantic human whose voice creeps higher and higher, a stressed male finch calls with a higher frequency. The researchers wondered if the mate of a stressed-out male notices this difference—and if so, how does she respond? Read More
Think you’ll need help following through on your New Year’s resolutions? Take some inspiration from these news-making animals of 2015. Soon you’ll be your best self…or possibly a sea monster. Either way, 2016 is sure to be great.
Get rid of unnecessary clutter Read More
New Caledonian crows are some of the world’s most famous non-human tool users. The crows employ sticks, leaves, and even bits of wire in the lab to probe holes in branches or logs, fishing out tasty bugs. But scientists are usually stuck studying these behaviors in artificial environments. To get a better perspective on how these birds make and use tools in nature, researchers in the United Kingdom tried something new: they turned wild crows into documentary filmmakers.
Jolyon Troscianko, of the University of Birmingham, and Christian Rutz, of the University of Oxford, developed tiny video cameras for spying on crows. Then they went to New Caledonia, the archipelago east of Australia where the birds (Corvus moneduloides) live.
In their forest study area, the researchers trapped 19 wild crows. Each time they trapped a bird, they held it overnight while custom-building and programming a video logger that wouldn’t weigh the bird down too much. They attached the camera to the underside of the bird’s tail, so that the lens pointed forward and up along the belly. Then they released the birds back into the forest. Read More