How fast did dinosaurs really go? Birds walking in mud provide new clues

The math used to calculate speed from dinosaur footprints may be off, a new study suggests

Image of a fossilized dinosaur footprint.

Fossil dinosaur footprints offer clues to how fast dinosaurs moved.

Greg Willis/Wikimedia Commons (CC BY-SA 2.0)

Over a video call from a dig site near Oxford, England, Peter Falkingham points his phone down to show a fossilized footprint of what was probably a large sauropod.