Yep, LA's La Brea Tar Pits. I pull book ideas from everywhere. Y'all have probably noticed that. I thought that the gift shop at the Page Museum, which is right there at the pits, offered an enticing array of woolly-mammoth-era reading for kids. Did I buy the books? No, I did not. I took pictures of them. (That was only one of many "stop-it-you're-embarrassing-me-Mom" moments for our 10 year old; I may also have called him "Honey" instead of his name that very same day. In public.)
We highly recommend a trip to the Page and the pits. Until then, read up:
Wild Cats, by John E. Becker (Darby Creek, 2008)
Prehistoric Mammals, by Alan Turner (National Geographic, 2004)
Big Cats, by Donna H. Bowman (Intervisual Books, 2008)
Sunset of the Sabertooth, by Mary Pope Osborne (Random House, 1996)
Sabertooths and the Ice Age: A Nonfiction Companion to Sunset of the Sabertooth, by Mary Pope Osborne (Random House, 2005)
Prehistoric Animals Stickers (Dover Publications, 1998)
Revenge of the Itty-Bitty Brothers, by Oliver Lin (Simon & Schuster, 2009)
Ice Age, by Stewart Ross (Barron's, 2009)
Sabertooth, by Patrick O'Brien (Henry Holt, 2008)
Mammoths and Mastodons: Titans of the Ice Age, by Cheryl Bardoe (Abrams, 2010)
Woolly Mammoth, by Mick Manning and Brita Granström (Natural History Museum [London, England], 2009)
You Wouldn't Want To Be a Mammoth Hunter!: Dangerous Beasts You'd Rather Not Encounter, by John Malam (Franklin Watts, 2004)
Rocks & Minerals (Eyewitness Workbooks), by Helen Whittaker (DK Publishing, 2008)
Dinosaurs came way before the time of the La Brea Tar Pits, but the store sells plenty of dino titles, too. More books from the Page's store here.