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Image of the Day
Image of the Day: The Last Sloth
Staff, The Scientist Staff | Nov 16, 2017
An artist’s impression suggests what the Caribbean may have looked like before humans arrived.
Mammalian Immunity: What’s RNAi Got to Do with It?
Shawna Williams | Jul 21, 2017
A new study adds to the evidence that mammalian cells can use small interfering RNAs to defend against viruses, but questions remain about physiological importance.
Earth Experiencing Sixth Mass Extinction: Study
Kerry Grens | Jul 11, 2017
Scientists describe the number of vertebrate species experiencing population declines as “biological annihilation.”
Source of Scales, Feathers, Hair
Tanya Lewis | Jun 27, 2016
Reptiles, birds, and mammals all produce tiny, bump-like structures during development.
Rethinking the Rise of Mammals
Bobby Bascomb | Nov 16, 2015
Mammals diversified 30 million years later than previously estimated, according to a new analysis of an ancient fossil.
Lost Y Chromosome Genes Found on Autosomes
Anna Azvolinsky | May 27, 2015
Mammalian Y chromosome genes with important functions are transferred to autosomal chromosomes more often than previously thought, a study shows.
Prehistoric Critters Change View of Mammal Evolution
Molly Sharlach | Sep 12, 2014
Three extinct squirrel-like species were identified from Jurassic-era fossils in China.
Female Pigs May Sense Sex of Sperm
Anna Azvolinsky | May 21, 2014
The oviducts of pigs exhibit different gene expression profiles depending on their exposure to sperm with either an X or a Y chromosome, a study shows.
Making Sense of the Narwhal Tusk
Kerry Grens | Mar 18, 2014
Emerging evidence suggests that the marine mammal’s long front tooth might help the narwhal sense environmental changes.
Clocks Versus Rocks
Ed Yong | Jan 14, 2014
A new analysis suggests that placental mammals originated while dinosaurs were dominant, contradicting a recent high-profile study.