The filtration system "keeps the pools consistently clean," says Greg Dykstra, partner at CLR Design Inc. of Philadelphia, the Denver Zoo's longtime design firm. "And the zoo won't have to dump ...

Modeled after a Kenyan nature preserve, the Denver Zoo is home to more than 4,000 animals, including tigers, black rhinos, kangaroos and orangutans. Sprawling across 80 acres of City Park ...