African Grey Hornbill

tags: African Grey Hornbill, Tockus nasutus, birds, mystery bird, bird ID quiz [Mystery bird] African Grey Hornbill, Tockus nasutus, photographed catching a dragonfly at the Pangani River Camp, Tanzania, Africa. [I will identify this bird for you in 48 hours] Image: Dan Logen, January 2010 [larger view]. Nikon D300s, 600 mm lens, ISO 640, 1/2500 sec, f/5 0 exposure compensation. Please name at least one field mark that supports your identification. The photographer writes: There seemed to be quite a lot of interest in the African Grey Hornbill's bill. Since it was partially obscured…