Olive Ibis

This relatively small ibis measures 65–75 cm in length, depending on subspecies. Recorded wing lengths in the various subspecies are 330–334 mm in olivacea, 309–355 mm in cupreipennis, 343–372 mm in akeleyorum, and 328 mm and 313 mm in males and females respectively of rothschildi. The culmen in olivacea measures 95–96 mm. Single male specimens of the subspecies akeleyorum, cupreipennis and rothschildi have reported culmen lengths of 108 mm, 85 mm and 95 mm respectively; with the corresponding lengths on females being 102 mm, 94 mm and 90 mm respectively. B. o. Voice: The call is a distinctive, loud, squawky "gar-wa", repeated several times and uttered in flight high above the trees. Reportedly, it only vocalizes in flight and then only during twilight. The rothschildi subspecies instead utters a call described as "HAAN-ha HAAN-ha". Other calls have been transcribed as "aka-a", "ka" and "kau".