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image: Image of the Day: The Last Sloth

Image of the Day: The Last Sloth

By | November 16, 2017

An artist’s impression suggests what the Caribbean may have looked like before humans arrived. 

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image: Mammalian Immunity: What’s RNAi Got to Do with It?

Mammalian Immunity: What’s RNAi Got to Do with It?

By | July 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.

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image: Earth Experiencing Sixth Mass Extinction: Study

Earth Experiencing Sixth Mass Extinction: Study

By | July 11, 2017

Scientists describe the number of vertebrate species experiencing population declines as “biological annihilation.”

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image: Source of Scales, Feathers, Hair

Source of Scales, Feathers, Hair

By | June 27, 2016

Reptiles, birds, and mammals all produce tiny, bump-like structures during development.   

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image: Rethinking the Rise of Mammals

Rethinking the Rise of Mammals

By | November 16, 2015

Mammals diversified 30 million years later than previously estimated, according to a new analysis of an ancient fossil.

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image: Lost Y Chromosome Genes Found on Autosomes

Lost Y Chromosome Genes Found on Autosomes

By | May 27, 2015

Mammalian Y chromosome genes with important functions are transferred to autosomal chromosomes more often than previously thought, a study shows.

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image: Prehistoric Critters Change View of Mammal Evolution

Prehistoric Critters Change View of Mammal Evolution

By | September 12, 2014

Three extinct squirrel-like species were identified from Jurassic-era fossils in China.

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image: Female Pigs May Sense Sex of Sperm

Female Pigs May Sense Sex of Sperm

By | 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. 

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image: Making Sense of the Narwhal Tusk

Making Sense of the Narwhal Tusk

By | March 18, 2014

Emerging evidence suggests that the marine mammal’s long front tooth might help the narwhal sense environmental changes.  

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image: Clocks Versus Rocks

Clocks Versus Rocks

By | January 14, 2014

A new analysis suggests that placental mammals originated while dinosaurs were dominant, contradicting a recent high-profile study.

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