Stone Age people used bone scrapers to make leather and pelts

Human coprophagy doesn’t surface in the zoo team’s review of other animals. For rabbits and a variety of other small animals with plant-rich diets, poop-eating serves as a digestive workaround for not being a cow, whose stomachs have extra compartments. “I had no idea how many baby animals ate their mom’s poop to get microbes to help populate the gut,” says evolutionary biologist Elaine J. Power, now retired in Eugene, Ore. Tallying just the examples from vertebrates reported in scientific journals, the authors document coprophagy in more than 150 species, from adult black bears to baby koalas.

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(Foxes bred to be aggressive, on the other hand, are definitely not happy to have people around, much like the fearful rats Cagan encountered at the institute.) In Kukekova’s early visits, about 70 percent of the tame foxes were considered “elite,” aquiver with excitement when people came around. To this day, the only other insect that is domesticated is the honeybee. In China, people began domesticating the larvae of silk moths for the fine, strong threads of their cocoons as early as 7,500 years ago, genetic evidence suggests. One central developmental change — in a temporary clump of cells called the neural crest — may be behind the suite of characteristics known as domestication syndrome. We summarize the week's scientific breakthroughs every Thursday.

• That could help “make them more adaptable to climate change and disease and all the challenges that wild species face,” James says.
• Puzzled scientists have been calling for thorough investigations as the government sends mixed messages on the cause of death.
• Institute of Environmental Health Sciences (NIEHS) used animal models to investigate why DES fostered the development of cancer in daughters of women treated to avoid miscarriages.
• During monthslong hunting trips at sea, these seals nap less than 20 minutes at a time and average just two hours of total sleep per day.
• Mason and her colleagues reasoned that a depressed animal would lose interest in its surroundings, but a bored animal might be drawn to both negative and positive stimuli, just to get a reprieve from monotony.

Science News

Many were domesticated before writing was even invented. Perhaps those dogs were part of an early, failed attempt at domestication, she says. The mitochondrial DNA of the Goyet and Russian dogs belongs to a maternal lineage that didn’t leave any modern descendants, researchers reported in Science in 2013. Scientists examined mitochondrial DNA, which is passed from mothers to offspring, to trace maternal lineages of ancient and modern dogs and wolves. Researchers also wrangle over where and how many times it happened.

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A wolf raided a crab trap. Was it tool use or just canine cunning?

Other animals receive estrogens, the primary female sex hormones, or progestins, semiandrogenic agents that shut down a female’s estrus cycle. Farmers fatten up two-thirds of these animals by using hormones. In plant sciences, Mark Chonofsky of Lexington, Mass., won for his research on Taxaceae, the plant family that includes the species from which the cancer drug Taxol is derived. Adiseshan won best of in the animal sciences category, Schwob in behavioral and social sciences, Boynton in environmental sciences, Larson in mathematical sciences and Shah in chemistry. Her analysis revealed that the bees and nematodes had a tight-knit relationship throughout evolutionary history, diverging into new species at the same time. Those prizes were part of nearly $4 million in scholarships, tuition grants and scientific trips and equipment awarded at the world’s largest high-school science competition.
Locating the cradle of most species’ domestication is difficult. Most domesticated mammals, including dogs, tend to have orionsbet casino review smaller bodies than their wild counterparts, with smaller skulls that have shorter, wider snouts and shorter, lower jaws. It’s also possible the animals were used for fur or meat. Those early dogs may have been used as pack animals to move mammoth carcasses from hunting grounds to living quarters, says Germonpré.
She has bachelor's degrees in physics and English, and a master's in science writing. Previously the staff writer for physical sciences at Science News, Maria Temming is the assistant managing editor at Science News Explores. The animal kingdom appears to have a new heavyweight champion. High-speed video reveals that youngsters can snap their claws up to about 600 kilometers per second per second — an acceleration 20 times as fast as their elders achieve. Because the newfound black hole boasts about the same heft as its surrounding galaxy, researchers think the black hole could have formed only through the collapse of a massive gas cloud.

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That new map suggests that dire wolves are more wolf-like than once thought, though still distantly related, Shapiro’s team reports in an upcoming pre-print that has yet to be peer-reviewed. Canis is the group that includes wolves, dogs and coyotes. At the time, “we thought that there was enough genetic divergence that they should not be in the genus Canis,” says Julie Meachen, a vertebrate paleontologist at Des Moines University in Iowa.
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