Observations on the breeding biology of the Writhed-billed Hornbill (Aceros waldeni) in the Philippines

Kauth, Marion; Engel, Sabine; Lastimoza, Lucia; Curio, Eberhard

doi:10.1007/bf01653471

Cited by 10 publications

(13 citation statements)

References 3 publications

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“…Observations were made of two writhed-bill and two tarictic broods (Curio et al 1996;Kauth et al 1998;Klop et al 2000) in Hamtang Forest near Mt. Baloy on Panay (one brood of each) and near Station Sibaliw in the NW Panay Peninsula.…”

Section: Methodsmentioning

confidence: 99%

“…The fruit diet was supplemented with insects, e.g. grasshopper, cicadas and cockroaches, and baby mice, on all of which tarictics were keener than were writhed-bills, in line with their diet in the wild (Kauth et al 1998;Klop et al 2000). A standard dose of 'Corvimin', a multi-vitamin formula, was given twice a week, and, after 2002, the essentially similar 'Vionate' instead.…”

Section: Methodsmentioning

confidence: 99%

“…1). Given a nestling period of 42-60 days (Kauth et al 1998), they may have been about 5 weeks old. At this age and after fledging, juveniles resemble the adult male as in most Aceros species (Kemp 1995); their facial skin is yellowish, the head and neck feathers dull rufous and the bill pinkish.…”

Section: Documentation In Captivitymentioning

confidence: 99%

“…Age inferred from date of picture as compared to breeding records in the wild (Kauth et al 1998 Fig. 1 b One sister had disappeared before c Sex inferred from both identity through age classes and that of opposite sex cage (nest?)…”

Section: Documentation Of Ornamental Development Including Short-termmentioning

confidence: 99%

“…Two of these permitted a description of the ornamentation of the head and its structures. One male was monitored in two consecutive seasons (1995,1996) at the same nest in Hamtang Forest (Curio et al 1996;Kauth et al 1998); an anomaly at the tip of one carpal joint enabled it to be identified individually. The other breeding male was tending a nest in south Pandan in 2001 where it was photographed by T. Laman (Vesilind 2002(Vesilind , 2003.…”

Section: Observations In the Wildmentioning

confidence: 99%

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On ornamental maturation of two Philippine hornbill species with a note on physiological colour change

Curio

2004

J Ornithol

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Two Philippine hornbill species, the Visayan writhed-billed hornbill (Aceros waldeni) and the Visayan tarictic hornbill (Penelopides panini panini), display on their heads multiple sexual ornaments in both sexes. An account is given of the maturation of these ornaments, except for the hood on the hind neck, from the nestling stage through age 5 years in the writhed-bill, and from fledgling stage through age 3+ years in the tarictic. Development proceeds in a staggered fashion, in that component traits of the compound ornament are added sequentially to a baseline already present in the nestling (bare facial skin) up until maturity. In same-aged pair mates of the writhed-bill, elements (dark grooves and wreaths in the red bill) were continually added until the reproductive age of 5 years, when observations ceased. Contrary to published accounts, only the writhed-bill passes through a male-like plumage in the nestling/ fledgling stage, whilst the tarictic juveniles attain their sexually dimorphic appearance right away. Writhed-bill chicks exhibit a colour dimorphism of eye (= iris) colour irrespective of sex, in which the two phases pass through two stages, but in reverse order. At least part of the ornaments can be interpreted as honest indicators of condition. Based on the concept of honest signalling, the multiple nature of the ornamentation is functionally explained by the 'multiple message hypothesis'. A physiological colour change between white and blue within seconds/minutes occurs in the bare facial skin patches of the tarictic and thus adds to the arsenal of hornbill multiple ornaments. This constitutes the first evidence for this type of colour change in a bird.

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Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Documentation In Captivitymentioning

confidence: 99%

Section: Documentation Of Ornamental Development Including Short-termmentioning

confidence: 99%

Section: Observations In the Wildmentioning

confidence: 99%

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