A new museum in northern Arizona features the fossilized feces of prehistoric animals. The Poozeum opened this spring in Williams along Route 66. The president and curator, George Frandsen, has been collecting the fossils known as coprolites for nearly three decades. His museum features roughly 7,000 specimens, including one suspected to be from a Tyrannosaurus rex. Frandsen holds two Guinness Book of World Records titles for parts of his collection. Paleontologists say it can be challenging to determine if a coprolite is really that and even more difficult to pin down what prehistoric animal might have been responsible for depositing it millions of years ago.