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| A first-year Black-eared Cuckoo on the left, adult on the right |
Once again I am grateful to Mark Clayton who organised the trip as part of a long-term study of birds in the area.
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| The second first-year bird |
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| One of the first-year birds |
Both first-year birds had faintly marked faces, with dull throat and breast colouring.
The moult sequence and timing of the various feathers of this species is poorly known, with the information used for the synopsis in the Handbook of Australian, New Zealand & Antarctic Birds being based in parts on only a sample of three birds. And we only have a sample of three. Therefore, I am open to discussion on any points raised.
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| The two young birds on the left have dull grey-brown rumps and tails; the adult bird on the right has a grey rump contrasting with a dark tail. The first-year birds have faded feathering overall, while that of the adult bird is fresh, unfaded and lustrous like other birds of the genus |
Although synchronous growth bars on the tail are used as an indication of a bird with its original tail feathers, it seems from comparison between these birds that the adult bird might not really have synchronous bars. Perhaps the feathers can grow and align to seem to be of the same age. The freshness and dark unfaded colouring of the adult bird's tail would seem to be recently grown. Yet, apart from the apparent synchronous tail growth bars, the bird has an otherwise adult plumage. Also, its tail is only slightly worn at the tips, and it has distinct white tips, as mentioned in the previous note, unlike the first-year birds which both have well-worn buff tips. Such bold white tips (compared with buff tips of definite young birds) are often an indication of an adult bird. I suggest that this is indeed a true adult bird which hatched at least two breeding seasons ago, and the first-year birds hatched one breeding season ago.
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| The first-year birds also had faded, frayed secondary coverts with buff tips, and darker, unfrayed primary coverts |
