Furry, spiky mammal scampered among dinosaurs

Early Cretaceous fur ball with spikes discovered in Spain

illustration of Spinolestes xenarthrosus

MESOZOIC MAMMAL  Spinolestes xenarthrosus lived 125 million years ago, weighed about as much as a possum and probably looked like small mammals do today. 

Oscar Sanisidro

When scales were all the rage, one early mammal sported fur and spines.