good tall aviaries. They seem to breed all their owls well (they had hand-raised ones on perches elsewhere which were bred here). In this (sorry, blurry) photo the aviary on the right holds buffy fish owls and spotted wood owls, and the one to the left has Malayan (barred) eagle owls. Other owls in this lot of aviaries were brown wood owls and barn owls. Elsewhere were reddish scops owls and Oriental bay owls.
See here for more on my visit to the bird park:
http://www.zoochat.com/249/penang-bird-park-13-april-2014-a-360901/