From the savannah area of the Karanambu Ranch, Guyana. Common in Guyana. Feeds on carrion and road kills, insects (especially ticks), nestlings, small reptiles and mammals, and fruit. Perches on the backs of cattle to pick ticks. There was a cattle herd in the area. We saw this while out looking for the Giant Anteater of which I have a photo here..
www.greenbackedheron.com/photo/2236854227 f/5.6, iso 1000, 1/800.