These fossils, belonging to the mammal-precursor species Brasilodon quadrangularis and Riograndia guaibensis, offer critical insights into the development of the mammalian jaw and middle ear, ...

Prefer Newsweek on Google to see more of our trusted coverage when you search. A tiny sharp-toothed rodent that roamed the earth 220 million years ago has emerged as a missing ancestor of today's ...

One of the most important steps in the evolution of modern mammals was the development of highly sensitive hearing. The middle ear of mammals, with an eardrum and several small bones, allows us to ...