This is a group of birds I have been increasingly interested in the past several months, that are also becoming increasingly rare in North American facilities owning to their generally low breeding success. So why not amass a list of which facilities house what? I'll start with what I know already with reasonable certainty.
Great Indian Hornbill
Toronto Zoo 1.1
Houston Zoo 1.1
Lowry Park Zoo 1.?
Zoo Miami 1.?
Rhinoceros Hornbill
Dallas World Aquarium 2.2?
Houston Zoo 1.1
Cincinnati Zoo ?.1
Toledo Zoo 1.1
Milwaukee County Zoo 1.1
Knobbed Hornbill
Woodland Park Zoo ?.1
St. Augustine Alligator Farm 1.1
San Diego Zoo Safari Park ?.?
Wreathed Hornbill
Dallas Zoo 1.1
San Antonio Zoo 1.1
Blyths/Papuan Hornbill
Peoria Zoo 1.?
Lincoln Park Zoo 1.1
Wrinkled Hornbill
Honolulu Zoo 1.1
San Diego Zoo 1.1
Sulawesi Tarictic Hornbill
San Diego Zoo 1.1
Lowry Park Zoo 3.2
San Diego Zoo Safari Park ?.?
Oriental Pied Hornbill
????
Palawan Hornbill
???
Great Indian Hornbill
Toronto Zoo 1.1
Houston Zoo 1.1
Lowry Park Zoo 1.?
Zoo Miami 1.?
Rhinoceros Hornbill
Dallas World Aquarium 2.2?
Houston Zoo 1.1
Cincinnati Zoo ?.1
Toledo Zoo 1.1
Milwaukee County Zoo 1.1
Knobbed Hornbill
Woodland Park Zoo ?.1
St. Augustine Alligator Farm 1.1
San Diego Zoo Safari Park ?.?
Wreathed Hornbill
Dallas Zoo 1.1
San Antonio Zoo 1.1
Blyths/Papuan Hornbill
Peoria Zoo 1.?
Lincoln Park Zoo 1.1
Wrinkled Hornbill
Honolulu Zoo 1.1
San Diego Zoo 1.1
Sulawesi Tarictic Hornbill
San Diego Zoo 1.1
Lowry Park Zoo 3.2
San Diego Zoo Safari Park ?.?
Oriental Pied Hornbill
????
Palawan Hornbill
???