Study suggests parts of the animals' backs and legs fused together to form wings.
Some evidence suggests that foxes may be trying to domesticate themselves.
New discovery could help scientists unearth more ancient microbial fossils and shed light on some big questions about early life on Earth.
Hummingbirds can distinguish blends of color that we see as ordinary hues.
Prehistoric remains also reveal signs of a particularly large predator.
A mysterious video shows worms fighting and dancing the "jitterbug."
When times get tough, an invasive comb jelly appears to make the strange evolutionary choice to cannibalize its young.