A mammoth tusk protruding from the riverbank on the Koyukuk River in Alaska. Adrienne Ghaly hide caption
woolly mammoth
Jaquel Spivey performs as Usher in A Strange Loop at Woolly Mammoth Theatre Company in Washington D.C. Teresa Castracane/Woolly Mammoth Theatre Company in Association with Playwrights Horizons and Page 73 Productions hide caption
A Pulitzer winner at the worst possible time, 'A Strange Loop' is Broadway-bound
An artist's impression of a woolly mammoth in a snow-covered environment. Leonello Calvetti/Stocktrek Images/Getty Images/Stocktrek Images hide caption
The 10,000 year old mammoth tusk at the Campbell Creek Science Center in Anchorage before it was stolen. Bob Wick/BLM via Flickr hide caption
Last year, China banned the sale of commercial elephant ivory to stop poaching. That's when interest in ancient, buried woolly mammoth tusks boomed. Amos Chapple/RFE/RL hide caption
Woolly Mammoths Are Long Gone, But The Hunt For Their Ivory Tusks Lives On
(Left) A close-up view of a spirally fractured mastodon femur. (Right) A boulder discovered at the Cerutti Mastodon site in San Diego County thought to have been used by early humans as a hammerstone. Tom Démeré/San Diego Natural History Museum hide caption
New Evidence Suggests Humans Arrived In The Americas Far Earlier Than Thought
A fossil of a Columbian Mammoth in the Page Museum at the La Brea Tar Pits, Los Angeles. Wikimedia Commons hide caption
Plumber apprentice Joe Wells touching what Burke Museum officials believe is the largest, most intact mammoth tusk, ever found in the region. Uncredited/AP hide caption
Woolly mammoths depended on tiny flowering plants for protein. Did the decline of the flowers cause their extinction? Per Möller/Johanna Anjar hide caption
A file photo from 2011 shows a man touching a giant bronze sculpture of a mammoth in the Siberian city of Khanty-Mansiysk. A team of Russian and South Korean scientists who found a well-preserved frozen woolly mammoth carcass this month say it also included blood. Natalia Kolesnikova/AFP/Getty Images hide caption