. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 1â1 1 1 1 1â1â B1 t I 1 jffg i i i i i i r i i i i i i i i B2 âi i 11 kl . i ¿ â W ' I \ p â Fig. 10: Sonagrams of the loudest calls of some Buceros hornbill species. Alâ 2 rhinoceros; Blâ2 â B. bicornis. B. female, yellow with orange preen oil applied over basal half; juvenile, yellow with orange base (Frith & Douglas 1978). Bare skin: smooth, circumorbital only: adult male, black; adult female, red with black eyelids forming ring round eye (Lint 1972, Riley
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 1â1 1 1 1 1â1â B1 t I 1 jffg i i i i i i r i i i i i i i i B2 âi i 11 kl . i ¿ â W ' I \ p â Fig. 10: Sonagrams of the loudest calls of some Buceros hornbill species. Alâ 2 rhinoceros; Blâ2 â B. bicornis. B. female, yellow with orange preen oil applied over basal half; juvenile, yellow with orange base (Frith & Douglas 1978). Bare skin: smooth, circumorbital only: adult male, black; adult female, red with black eyelids forming ring round eye (Lint 1972, Riley 1938); juvenile, grey. Eye colour: adult male, red; adult female, white; juvenile, grey (Frith & Douglas 1978). Leg colour: adult male and adult female, olive-green (Riley 1938); juvenile, undescribed. Loudest call (no recording available): harsh croak, more wheezy in females (Banks 1935), sharp kak note when perched with loud goose-like honking, usually uttered antiphonally by pair, in flight (Medway & Wells 1976). Display: jerks head upwards with each note, raising bill skywards (Frith & Douglas 1978). Subspecies: B. r. borneoensis Schlegel & Müller, 1840. (28 a.) Smaller than B. r. rhinoceros with casque shorter, broader and tip more recurved. Form and softpart colours like B. r. rhinoceros. Loudest call (Fig. 10A1 â2, Sarawak, Alan Kemp): loud, deep grunts (Fig. 10A1) and braying flight call (Fig. 10A2), female following male antiphonally at slightly higher pitch in each case. Display: like B. r. rhinoceros (pers. obs.).. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Zoologisches Forschungsinstitut und Museum Alexander Koenig. Bonn : Das Forschungsinstitut
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Keywords: ., bookcentury1900, bookcoll, booksubjectbiology, booksubjectzoology
