A record-breaking site in Bolivia preserves foot, tail, and clawprints left behind by hundreds, or even thousands, of dinosaurs in mud at the edge of what was then a lake. Finding all the prints, let alone establishing which came from the same individuals, will be an immense task, but already 16,600 prints have been found, the largest number ever recorded at one site. This set of tracks also sets the record for the most trackways, tailprints, and continuous swimways. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

A waterhole in Africa draws many species today, each of which will leave its prints in wet clay when conditions are right. The same thing must have happened millions of times through the Jurassic and Cretaceous periods, but o

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