Who would have known critter poop was so big with kids? There's a whole franchise out there, with "Who Pooped in the Park" books for Yellowstone, Grand Canyon, Glacier, Rocky Mountain, Shenandoah and many more parks.

This book, on what pooped in Big Bend National Park, is aimed at kids age 8 and above. Part of the motivation in writing the book stems from the fact that wildlife in Big Bend is not always easy to spot. But scat and tracks often can be found.

Robert Rath illustrated the book with full-page, full-color cartoon-style pictures based around a family of four � mom and dad and two young kids � who are on vacation in Big Bend. Through the narrative writer Gary D. Robson intersperses details about the park, discussing its size and landscape and wildlife, while focusing on wildlife tracks and scat.

As the family's vacation continues, they find other evidence of wildlife � from scat to tracks and even antlers. While Mr. Rath points out the differences of some animals, such as mule deer and white-tailed deer, with his drawings, Mr. Robson drops in "The Straight Poop," little wildlife factoids such as that female deer don't grow antlers, that rabbits eat their own scat to maximize the nutritional value of their forage, and that roadrunners can run up to 15 miles per hour.

Though aimed at a youthful audience, this book and others in the series can be fun for families visiting national parks and help kids, and even their parents, learn some natural history on their vacations."

-Kurt Repanshek, National Parks Traveler