National Zoo News News from the National Zoo Celebrate Bao Baos birthday and panda conservation New Smithsonian’s National Zoo 125th anniversary limited edition SmarTrip cards SCBI scientists track wild black-crowned night herons that summer at the Zoo Smithsonian & SVF Biodiversity preservation project highlights heritage rare-breed conservation Four litters of red panda cubs born at SCBI Sloth bear grows up Six lion cubs on exhibit