Learn how fossils from Arizona’s Petrified Forest National Park revealed that a Late Triassic crocodile relative may have started life on four legs before walking on two as an adult.

A "peculiar" ancient relative of the crocodile which experts believe began life on four legs before, in adulthood, it learned ...

If you thought that crocodiles were menacing enough, be glad that you didn’t live in Arizona some 225–201 million years ...

Scientists wanted to know why the iconic triceratops had such an unusually large nose compared to most species on Earthj.

For years, we suspected that Alvarezsaurids underwent a rare process of evolutionary miniaturization directly coupled to a ...

Hello {{ subscriber.first_name | strip | default: “there” }}. Sarah Jacobsen here to jumpstart your Friday! Good morning! Today, we have the latest on Hewlett-Packard’s upcoming exit from Boise, ...

A few teeth, smaller than a grain of rice, are changing the map of your earliest primate relatives. They come from a creature called Purgatorius, a tiny tree-dwelling mammal that lived about 66 ...

Ants trapped in amber reveal possible partnerships and parasites, offering a rare glimpse into ecosystems from nearly 100 ...

New, miniscule fossils of the earliest-known relative of all primates, including humans, Purgatorius, have been unearthed in a more southern region of North America than ever before – and the ...

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A sediment-washing “bubbler” helped researchers recover 65.5-million-year-old teeth that illuminate how early primate relatives spread after the mass extinction.

New minuscule fossils of Purgatorius, the earliest-known relative of all primates—including humans—have been unearthed in a ...