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Illinois State Museum: The Midwestern United States 16,000 Years Ago
What did Northern America look like 16,000 years ago? Were the plants the same? What happened to the mastodons and the saber-toothed cats? Here's a short website that is easy-to-understand and supplies at least some of the answers.
San Diego Natural History Museum
San Diego Natural History Museum: Fossil Field Guide: Dire Wolf
A look at what fossil evidence reveals about life and ecological interactions of the extinct dire wolf.