This is a reconstruction of the prehistoric mammal Spinolestes in the Cretaceous-period Las Hoyas wetland. This image is not associated with the current study but demonstrates a dark-furred mammal ...

"These extinct early mammals had distinct lifestyles, ranging from ground-dwelling and burrowing to gliding through the treetops like modern-day flying squirrels," Li Ruoshuang, the paper's first ...

The early mammals that lived alongside the dinosaurs upwards of 150 million years ago (mya) were likely covered in dark and dusky greyish-brown fur, according to a quantitative reconstruction of ...