Penguins swim in the Detroit Zoo's new Polk Penguin Conservation Center, Wednesday, April 13, 2016, in Royal Oak, Mich. The new penguin habitat that the zoo calls the worldís largest such facility offers its 80-plus residents new rocks for climbing, waves, snow and better ice conditions, while allowing visitors to come nose-to-beak with the stately birds. A preview Wednesday showed off the $30 million center, which features an underwater gallery and two tunnels where visitors can watch four species of penguins swim above, around and below them. It opens to the public Monday. (AP Photo/Carlos Osorio)
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