Researchers map 33 new big game migrations across American West

A new set of maps that document the movements of ungulates was published today in the fourth volume of the Ungulate Migrations of the Western United States. The maps in this collaborative U.S. Geological Survey report series ...

Fossil footprint discoveries and what they tell us

Footprints on a sandy surface don't usually last long: they're washed away by water, wiped out by wind or covered over by new tracks. At certain sites in southern Africa, though, some traces of animals have lasted for many ...

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