Science

Scientists were wrong about this strange mammal for nearly 40 years

Source: FlexChar · Published Sep 28, 2026, 2:25 PM

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.

In Science, FlexChar puts this story at the center of the day: 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. FlexChar is surfacing it because it is driving searches and conversation right now.

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Scientists were wrong about this strange mammal for nearly 40 years

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