ADVANCE FOR SATURDAY, MAY 3 AND THEREAFTER - In a Tuesday, April 22, 2014 photo, paddlers head back to the landing at the end of a tour Sweet Marsh near Tripoli, Iowa, with Crawdaddy Outdoors. The 3,000-acre wildlife area contains multiple habitats ideal for a variety of species. (AP Photo/Waterloo Courier, Brandon Pollock)
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