Two small dinosaurs with bat-like wings, Yi and Ambopteryx, couldn't take the air as well as birds.
Crickets, katydids, and grasshoppers have been singing the same tune for more than 300 million years, a new study shows.
New research indicates rapid evolution in some great ape Y chromosomes, but not others. The scientists wonder if mating habits are why.
The New Guinea singing dog was thought to be extinct in the wild, but new research shows they're nearly identical to another dog.
In a surprising brain-body connection, immune cells make a molecule called il-17 that may be vital for normal brain function, a study with mice shows.
After mating, some male butterflies seal their mate's genitalia. But females have evolved ways of fighting back or getting around the "mating plug."
"We wanted to know, do large frogs have large tadpoles and small frogs small tadpoles, or are the sizes between the two decoupled?'"
New insights into how ants and bacteria became a single organism may lead to a better understanding of the origin of complex organisms, researchers report.
The remains of Bronze Age warriors suggest lactose tolerance, or the ability to digest milk, spread rapidly throughout Central Europe.
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