Having mated pairs of hornbills is a delicate affair at setting up pairings and looking closely at individual birds' behaviors'. It is no good idea to put birds from separate aviaries into one after initial period. It is better to have separate aviaries and then a half-way house approach with a small cage in the aviary where the introduction is supposed to take place and let the birds' decide. Aggression or non-pairing behavior is very self evident in this approach. If no or apprehensive it is a no go for further pairing. I am not sure if many or most zoos use this as a common approach now or not. The above story-line might seem to have misread this approach or its indicative behaviors by the birds themselves. Seems - in my humble opinion - not a great pairing ... But as I say it is far from easy ... this with hornbills!!! D.N. underestimate this please (and do not take this as criticism of the zoo concerned, merely some feedback on hornbill management and ecology and how best this may be approached under captive conditions).Sad news Concave-casqued hornbill, Asha, was put down. She was 51 and you only saw here while out with keepers due to the fact she was blind. In the zoo's obituary for her they mentioned she was actually blinded by our male Jonah while breeding. She ended up with brain damage which resulted in vision loss. Answers a lot of questions I had. Why was she blind? I assumed age. Why is Jonah not allowed a mate? He's known for being aggressive but I didnt think he had hurt her.