Image caption
The natural asphalt seeps at the La Brea Tar Pits in Los Angeles, CA, harbor a bonanza of Ice Age fossils of both prey animals like mammoths and their predators, including saber-tooth carts and dire wolves. Photo by John Fladd, showing a detail from the frieze above the front entrance to the Page Museum at the La Brea Tar Pits. Used under a Creative Commons license.