Scientists were wrong about this strange mammal for nearly 40 years

A beautifully preserved fossil from Mongolia’s Gobi Desert has solved a mystery that puzzled paleontologists for nearly 40 years. Tamirkhan balcarceli shows that zhelestids were not early relatives of modern placental mammals, despite having teeth that seemed to suggest they were. Instead, the rabbit-like animal belonged to a separate lineage of small Cretaceous mammals.