Jurassic fossils show modern mammals grow faster than ancient ones

The 166-million-year-old fossils of an adult and a juvenile of the same extinct mammal species reveal that they had longer “childhoods” and lifespans than similar species today

​The 166-million-year-old fossils of an adult and a juvenile of the same extinct mammal species reveal that they had longer “childhoods” and lifespans than similar species today The 166-million-year-old fossils of an adult and a juvenile of the same extinct mammal species reveal that they had longer “childhoods” and lifespans than similar species today