Black squirrels — a relic of ancient, old-growth forests — are now more common in cities. To understand why, scientists want to track the color of squirrels in your backyard. In 1902, an international ...

The UK is home to two squirrel species – the Eurasian red squirrel, Sciurus vulgaris, and the grey squirrel, Sciurus carolinensis. The species you’re more likely to see scampering through the trees or ...