Not all the exotic looking birds at the Smithsonian National Zoo are captive. The Black-Crowned Night Heron has been visiting this area long before there was a zoo. Every spring, the herons descend upon the National Zoo. It is the only known breeding colony, for these Herons in this region. Now day, the herons have the added benefit of snacking on fish thrown by the zoo keepers. Not all that is wild is caged at the zoo. The herons are easily photographed as they wait, motionless for feeding time. Actually, they are nocturnal and remain motionless during the day, become active at night.