These are hand-raised owls on display perches. Breeding owls are held in large aviaries elsewhere in the park.
Left to right: brown wood owl (Strix leptogrammica), reddish scops owl (Otus rufescens), spotted wood owl (Strix seloputo) and buffy fish owl (Ketupa ketupu). To the right were Oriental bay owls (Phodilus badius).
See here for more on my visit to the bird park:
http://www.zoochat.com/249/penang-bird-park-13-april-2014-a-360901/
