. Bulletin of the British Ornithologists' Club. Notes on a Lanner with malformed bill, and on hornbills feeding on oil palm fruits by W. Dean Received 21st March, 1975 In August 1970 an immature Lanner Falco biarmicus was found dead on the national road 16 km north-east of Christiana, Transvaal, South Africa. The bird was made into a study skin and is now in the collection of the Alexander McGregor Memorial Museum, Kimberley (specimen no. NMK/B/1180). It has the upper and lower mandibles malformed as shown in the Plate. The upper mandible curves down sharply and is twisted laterally to th
. Bulletin of the British Ornithologists' Club. Notes on a Lanner with malformed bill, and on hornbills feeding on oil palm fruits by W. Dean Received 21st March, 1975 In August 1970 an immature Lanner Falco biarmicus was found dead on the national road 16 km north-east of Christiana, Transvaal, South Africa. The bird was made into a study skin and is now in the collection of the Alexander McGregor Memorial Museum, Kimberley (specimen no. NMK/B/1180). It has the upper and lower mandibles malformed as shown in the Plate. The upper mandible curves down sharply and is twisted laterally to the right crossing the lower mandible which has projected beyond the upper by 5 mm. The lower mandible is also twisted laterally. On dissection the bird. Immature Lanner with malformed bill. proved to be in fair condition with a small amount of fat present. The severely abraded condition of the rectrices and primaries indicated that it had been obtaining food by scavenging along roads. Brooke & Jeffery (1972, Bull. Brit. Orn. CI. 92: 19) list several species of birds, including three hornbills, taking nuts of the oil palm Elaets guineensis. In the Quicama National Park, Luanda, at ca. 90 20'S., 130 46'E., the Crowned Hornbill Tockus alboterminatus was recorded on seven occasions between 26 July and 13 August 1972 feeding on oil palm nuts, and the Yellow-billed Hornbill T. flavirostris as twice taking oil palm nuts at the same time and place. The stomach contents of a female Laughing Hornbill Bycanistes sharpii, collected on 16 August 1972 in evergreen forest about 20 km north of Cabinda, consisted of oil palm nut fibre and oil. I am grateful to the Peabody Museum of Natural History, Yale University for the opportunity to make these hornbill notes. 55. 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 British
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