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CHICAGO, IL - SEPTEMBER 17:  King, an Eastern black rhinoceros born August 26, makes his public debut at the Lincoln Park Zoo with his mother Kapuki on September 17, 2013 in Chicago, Illinois. King's father Maku, 27, is on breeding loan from Caldwell Zoo in Tyler, Texas and his mother, 8, is on loan from Brookfield Zoo in suburban Chicago.  Eastern black rhinos are critically endangered in their native Africa due largely to poaching.  (Photo by Scott Olson/Getty Images)
CHICAGO, IL - SEPTEMBER 17:  King, an Eastern black rhinoceros born August 26, makes his public debut at the Lincoln Park Zoo with his mother Kapuki on September 17, 2013 in Chicago, Illinois. King's father Maku, 27, is on breeding loan from Caldwell Zoo in Tyler, Texas and his mother, 8, is on loan from Brookfield Zoo in suburban Chicago.  Eastern black rhinos are critically endangered in their native Africa due largely to poaching.  (Photo by Scott Olson/Getty Images)

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Imagine a world without its rhinos. CNN's Michael Holmes looks at the extensive effort to bring the rhino population back from the brink.

Saving the world's rhinos

Imagine a world without its rhinos. CNN's Michael Holmes looks at the extensive effort to bring the rhino population back from the brink.