Identification Help Needed

Greetings, my fellow bone-collectors. I am in need of some seasoned assistance.

A good friend of mine's grandfather recently passed, and his estate is being divided and sold. In his possession was a unique collection of skulls. While most of the others were called for, no one seemed to want these three beautiful birds. My buddy asked if I would perhaps be interested in getting them. I have not yet, but I am curious as to the identity of these birds, as I believe them to be mislabeled. I had my friend send me pictures, and I was hoping that someone may help me to properly identify them.

In respective order, they were labeled as a Hammertop Hornbill, a Pied Hornbill, and a Red-Billed Hornbill. No distinction was given to gender, and my friend seems to think the labels may have gotten mixed during one of their grandfather's moves. As I haven't yet had the pleasure of working with any hornbills or birds of this nature, I humbly request some assistance. Yes, they legally obtained them. No, I do not own them, so I cannot sell to you what I don't own. Strictly looking for identification assistance, please.

 

Thank you all very much for your help in properly labeling these. I'll get the info passed along right away!