This is a Von Der Decken's Hornbill. This bird showed up just outside our room on our last morning in the Serengeti. A wonderful sendoff!  An interesting fact about hornbill breeding: Males find a tree cavity and entice females by bringing her mudding material and food gifts. Females do the mudding, which turns rock-hard when dried. Females then enter the cavity before mudding up the entrance, leaving just a slim slit. For over two months, males feed the trapped female and the chicks when they hatch, through the small vertical slit. Females break out about two weeks before the young in order to help feed them. When the young emerge, they are fully flighted, though their parents will continue to offer them food for another week.