| Titre : | Observations of two Levaillant's Cuckoo Clamator levaillantii fledglings together, or of one or two together with host fledglings (2022) |
| Auteurs : | Clive R. Barlow, Auteur ; Clive F. Mann, Auteur |
| Type de document : | Article |
| Dans : | Malimbus (44(2) September, 2022) |
| Article en page(s) : | 85-100 |
| Résumé : | Levaillant's Cuckoo Clamator levaillantii does not evict the eggs or chicks of its hosts, but little is known about the fledging success of host chicks and cuckoo chicks from parasitised nests. We gathered published and unpublished reports of Levaillant's Cuckoo fledglings from across the range of the species, from West to southern Africa (but none found from East Africa). These included new observations from The Gambia of a group of Brown Babblers Turdoides plebejus feeding a fledged Levaillant's Cuckoo and two of their own fledglings, and two cases of two Levaillant's Cuckoo fledglings together in Brown Babbler groups. These are the first records of these phenomena in West Africa, although both had earlier been noted in southern Africa, where hitherto unpublished records improve information on their frequency. Among the 58 records found of Levaillant's Cuckoo fledglings, c. 16 % showed that a cuckoo fledged along with host chicks, and another 17 % were of two cuckoos apparently fledged from a single nest. Two records described both phenomena in a single brood. Many records did not state whether or not babbler host groups contained fledgling babblers, so the frequency of parasite and host chicks fledging together may be an underestimate. We describe characteristics that distinguish fledgling babblers from adults, particularly eye colour and gape flanges, which may be used to improve data on this. We confirm that Levaillant's Cuckoo fledglings have a brighter, orange-red mouth interior as compared with the duller, paler mouth of the young of babbler host species. |
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