By Mary Forgione
Zoos, organizations and preserves around the world will mark World Rhino Day 2013 on Sunday, Sept. 22, with events in the U.S. and overseas. The idea is to raise awareness about protecting rhinoceros from deadly poaching that continues to threaten animals in Africa and Asia. Rhino horns are valued on the international black market for their purported "medicinal" values -- something rhino organizations work hard to combat. Here's a glimpse of these lovely and endangered creatures, including a baby rhino born in Chicago's zoo. Photos.