Newly discovered fossils reveal a lineage of animals thought to have led to dinosaurs taking hold in Tanzania and Zambia, many millions of years before dinosaur relatives were seen in the fossil record elsewhere on Earth.
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The stomach and intestines of certain Dolly Varden trout double to quadruple in size during month-long, salmon-egg-eating binges in Alaska each August. It’s the first time researchers have documented such fish gut flexibility in the wild.
New work in Argentina where scientists had previously thought Earth’s first grasslands emerged 38 million years ago, shows the area at the time covered with tropical forests rich with palms, bamboos and gingers. Grit and volcanic ash in those forests could have caused the evolution of teeth in horse-like animals that scientists mistakenly thought were adaptations in response to emerging grasslands.
Species facing widespread and rapid environmental changes can sometimes evolve quickly enough to dodge the extinction bullet. UW scientists consider the genetic underpinnings of such evolutionary rescue.
Taking into consideration size, an ancient relative of piranhas weighing about 20 pounds delivered a bite with more force than prehistoric whale-eating sharks or – even – Tyrannosaurus rex.
Microorganisms – 99 percent more kinds than had been reported in findings published just four months ago – are hitching rides in the upper troposphere from Asia.
UW librarians acted quickly to eliminate bedbugs in books last August.