For two weekends I was there in BT the pair of majestic Rhinocerous Hornbill were there to feed on the tiniest of ficus. It uncanny nimble on the fruits with its tip of the large beak and then turn upwards to swallow them. I cannot imagine how much they will eat just to fill their gizzard. They were spotted in 2 sessions in the morning. I left the place after 12 noon.
Even the Siamang was there to feast on the fruits oblivious of the people below. It was good for tourism ; if not the place has nothing much to experience other than the Garden and cool weather.