Wendy Shattil and Bob Rozinski have published their 11th book, "Valley of the Dunes." The 152-page coffee-table book features 120 of the duo’s favorite photos taken while exploring Colorado’s Great Sand Dunes National Park over the past 25 years.

A selection of photos from the book can be viewed at www.dancingpelican.com. Autographed copies may be purchased from the web site for $19.95 each.

Other Gear: "We have picked up a lot of small tripods; a variety of Gitzo ball heads," says Rozinski, who generally prefers Bogen. "We haven't gone to graphite at this point, because we are still strong enough to carry the other ones. I like the flexibility of the tripods we have, and we will sacrifice weight sometimes for something more flexible in the field." For transportation, they use an old Toyota Land Cruiser and a new Toyota pickup. "We are very adept at photographing from the vehicles," he says. "We have a scrap aluminum place near us, and we have conjured up some door and floor mounts that are so strong, you can tip the car over with one of them."

Advice to aspiring nature photographers: "If you enjoy it, don't do it for a living," Shattil warns. "Do it in a manner so that you can do what you want, when you want. Learn as much as you can about the animals. Spend as much time as you can with the animals. Look at others' pictures. You can't copy what someone else created, but something can stick in your mind. And perhaps if you are lucky, you can get that on film."

Website: dancingpelican.com

For more than 20 years, the team of Wendy Shattil and Bob Rozinski have endured in a competitive wildlife photography market while promoting environmental awareness.

For 50 years, Colorado's Rocky Mountain Arsenal was the U.S. Army's nerve center for deadly gas. From the months after Pearl Harbor to the closing days of the Cold War, the 17,000 acres of prairie grass outside Denver were home to a stockpile of artillery shells crammed full of mustard gas, white phosphor munitions and incendiary cluster bombs. Native waterfowl drank from open retention ponds filled with a grim cocktail of...