Articles with the keyword: 
A quarter of mammals face extinction
sea-maid submitted, created time 3 months 1 day (www.nature.com)
This article covers one of the most, possibly the most, comprehensive studies of endangered animals in human history. Previous efforts have had to limit themselves to only better-known or better-studied species, but this one covers marine and obscure mammals as well.
"One in four of the world's mammal species is threatened with extinction, according to the first comprehensive survey of this class of animal. Populations are declining in half of all mammal species, with some experiencing an extreme decline. Tasmanian devil (Sarcophilus harrisii) numbers have plummeted by 60%" since 1998 
Woolly mammoths native to what's now the U.S., says study
Darkfrog submitted, created time 4 months 2 days (sciencenow.sciencemag.org)
Recent DNA tests of preserved DNA have allowed us to sort prehistoric mammoths into three groups: One subspecies lived in Eurasia, one in North America, and another ranged through both. For a long time, it was thought that mammoths originated in Eurasia because the fossils that have been found there are older. While this seems to be true, the studies also show that the subspecies that arose in North America crossed the Bering Strait and supplanted the other two a few hundred thousand years ago.
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sea-maid submitted, created time 5 months 2 weeks (sciencenow.sciencemag.org)
Researchers have spent decades trying to understand the confusing array of sleep patterns found in mammals. A donkey typically snoozes for just three hours a day, for instance, and armadillos and bats can be dead to the world for twenty hours a day. To explain the differences, scientists have offered a slew of theories, ranging from the idea that smaller animals need more sleep to conserve energy and maintain body temperature to the need to avoid predators.
Rodent Bones of Contention--When Did Humans Reach New Zealand?
jerry submitted, created time 7 months 4 days (sciencenow.sciencemag.org)
Carbon dating of ancient rat bones suggests that humans first arrived in New Zealand in 1280 or later...
sea-maid submitted, created time 7 months 1 week (genomebiology.com)
Several genes implicated in food digestion have been deleted or inactivated in platypus. This loss perhaps explains the anatomical and physiological differences in the gastrointestinal tract between monotremes and other vertebrates and provides insights into platypus genome evolution.
The branching program of mouse lung development
kavin submitted, created time 8 months 1 hour (www.nature.com)
Mammalian lungs are branched networks containing thousands to millions of airways arrayed in intricate patterns that are crucial for respiration. The paper presents the complete three-dimensional branching pattern and lineage of the mouse bronchial tree, reconstructed from an analysis of hundreds of developmental intermediates. It also proposes that each mode of branching is controlled by a genetically encoded subroutine, a series of local patterning and morphogenesis operations.
Gene Studies Tell Placenta's Tale
Eric wu submitted, created time 8 months 2 weeks (sciencenow.sciencemag.org)
When it comes to pregnancy, mice and elephants couldn't be more different: A mouse mom births a dozen pups in less than a month, whereas it takes an elephant about two years to produce a single calf. A well-adapted placenta makes this diversity possible. Now, a new genetic study is shedding light on how this important organ evolved--and how it became fine-tuned to meet the specific reproductive needs of mice, elephants and humans.
Sue Wu submitted, created time 9 months 2 weeks (sciencenow.sciencemag.org)
Milk may be good for growing bones, but it also had a powerful effect on mammalian evolution.
Bat's powerful lift is illuminated by fog
sumsung submitted, created time 10 months 1 week (www.nature.com)
Bats have a clever aerodynamic trick to make flying easier, researchers have found: the sharp edge at the front of their wings cuts through the air in such a way as to create a vortex on top of the wing, producing up to 40% of the lift needed to stay aloft.
Ancient bat flew without echolocation
sumsung submitted, created time 10 months 3 weeks (www.nature.com)
Among those who study the evolution of bats, the question of whether the bats developed echolocation and then flight, flight and then echolocation or developed both traits in tandem is a matter of great debate. A discovery in Wyoming not long ago has tossed some more gas on that fire.
The 52.5-million-year-old bat unusually had a claw on all five digits of each limb, earning it the nickname "20-clawed bat." Its anatomy shows that it captured its prey without the use of echolocation. The echo-first campers have yet to respond.
Naked mole-rats don't feel the burn
Sue Wu submitted, created time 11 months 1 week (www.nature.com)
Researchers have added to the list of biological curiosities about mole-rats: the animals do not feel all types of pain. The discovery could eventually help humans who are battling chronic discomfort.
Eric wu submitted, created time 1 year 3 weeks (sciencenow.sciencemag.org)
As a hair-dye ad once teased, only her hairdresser knows for sure. When it comes to the question of whether chimpanzees go through menopause, no researchers seem to know for sure--and there's no equivalent of a hairdresser to turn to for the definitive answer. Now the most comprehensive study ever of reproduction in wild female chimpanzees has added important insights that both move closer to an answer and add more puzzling questions.
South China tiger cub born in Africa
jane2007 submitted, created time 1 year 1 month (www.nature.com)
A 1-kilogram ball of fur, yet to be named, may be the best hope yet for saving the critically endangered South China tiger. That’s assuming that the male cub, born over the weekend on a wild-game reserve in South Africa, will one day be able to adjust to the jungles of China.
That's a good news to the infrequent and endangered species.
Biologist 'discovers' scentless giant peccary
yangjane submitted, created time 1 year 2 months (www.theregister.co.uk)
Dutch biologist Marc van Roosmalen has expanded the list of known peccary species to four following his "discovery" of the giant peccary, aka Pecari maximus, in the basin of the Rio Aripuanã in the south eastern Amazon.
Evolution in the hypervariable environment of Madagascar
jiangyun submitted, created time 1 year 4 months (www.pnas.org)
We show that the diverse ecoregions of Madagascar share one distinctive climatic feature: unpredictable intra- or interannual precipitation compared with other regions with comparable rainfall. Climatic unpredictability is associated with unpredictable patterns of fruiting and flowering. It is argued that these features have shaped the evolution of distinctive characteristics in the mammalian fauna of the island
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