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 ...

sharks and mammalian ancestors from the Mesozoic era. The data will help us answer crucial questions about mass extinctions and how species were distributed across our nation millions of years ago.

This is likely because birds are the only living descendants of dinosaurs around today, while other species on this list ... animals with upright limbs that lived on land during the Mesozoic Era ...