The tracks showed human activity in the area occurred between 23,000 and 21,000 years ago—a timeline that would upend anthropologists' understanding of when cultures developed in North America.

The parasite — the larva of the new world screwworm fly — can devastate cattle herds and is rife in parts of Central America.

At Rimrock Draw Rock Shelter in Oregon, archaeologists found a stone tool stained with Ice Age bison blood and teeth from extinct animals dating to 18,250 years ago. This discovery predates Clovis ...

The tracks showed human activity in the area occurred between 23,000 and 21,000 years ago – a timeline that would upend anthropologists' understanding of when cultures developed in North America.

The government's confirmation of a screwworm case comes just over a week after U.S. Department of Agriculture Secretary ...

UofA study confirms earliest evidence of humans A new study by the University of Arizona shows human life in North America may have developed much earlier than we thought. Stephanie Duprey reports.

A new study takes another look at some of the oldest known stone tools and suggests their makers transported materials for up ...

A new study by University of Arizona researchers bolsters the case that fossilized footprints in White Sands, New Mexico, are the earliest evidence of humans in the Americas.

While rare in humans, the parasite is a major concern for livestock, with infestations capable of devastating cattle populations.