Hi...I am true lover of Hornbill by heart and try to snap pictures of them throughout India. Till today I snapped only 2 kind. Few days ago I saw them near Mahananda EMS at Latpanchar,a place called Nursery where a pair usually come every morning for feeding. I saw them...they stayed in a while..may be an hour or more. They stayed on a particular free for fruits. It's Rufous Necked Pair for sure.