Abstract:Several species of hornbills are known to develop dorsal air sacs after hatching, which present as a pocket of air under their skin. These increase in size as the chicks grow, and gradually disappear as the chicks develop feathers. However, this feature is not well-described, nor do we know the extent it occurs in Bucerotids. Here, it is reported in a clutch of hand-reared Von der Decken’s hornbills ( Tockus deckeni) ( n = 5) at Jurong Bird Park, Singapore. Air sacs were not present at hatch, but developed wit… Show more
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