canberrabirds

FW: [canberrabirds] Juvenile Brush Cuckoo?

To: <>
Subject: FW: [canberrabirds] Juvenile Brush Cuckoo?
From: "Geoffrey Dabb" <>
Date: Sat, 7 Dec 2013 11:41:02 +1100

Interesting.  Exactly a year ago a similar bird was shown- and briefly discussed -  on this chatline.  The 2 birds are show below.

 

 

Both appear to be juveniles or sub-adult, from the overall brownish colouration, the main difference being the faintly barred underparts on this week’s bird.  Now, according to HANZAB on the JUV plumages:   BRUSH – ‘[underparts] boldly marked throughout : breast, broadly and irregularly barred or mottled by irregular dark-brown or black-brown barring; belly flanks and vent more sparsely and regularly barred dark-brown to black-brown …’  FAN-TAILED -  ‘Upper breast like foreneck:  cream to white faintly marked by broad and irregular grey-brown bars that do not contrast strongly.  Lower breast, belly, vent and flanks similar but with whiter ground-colour and denser paler-brown barring’.   However, the orbital ring for the BRUSH juv is given as ‘narrower than in adult, dark and dirty grey’;   and for the FAN-TAILED ‘pale-yellow; at first very narrow and inconspicuous with green or grey tinge; later as adult’  [which is ‘wide contrasting pale yellow to bright yellow, sometimes with orange tinge’].  

 

Both birds here have a conspicuously yellowish orbital ring, although the r/hand bird is in shade.  My guess is that both birds are sub-adult FAN-TAILED, the left-hand bird being closer to adult. The HANZAB illustrations are consistent with that.    I don’t know how the moult progresses but they might be from the previous nesting season.

 

From: Steve Holliday [
Sent: Saturday, 7 December 2013 9:01 AM
To: 'Canberrabirds'
Subject: RE: [canberrabirds] Juvenile Brush Cuckoo?

 

Brush Cuckoo also has a rare barred morph. If I recall correctly it has only been recorded in females. Another possibility for this bird.

 

From: Philip Veerman
Sent: Friday, 6 December 2013 9:15 PM
To: 'Rob Geraghty'; 'Canberrabirds'
Subject: RE: [canberrabirds] Juvenile Brush Cuckoo?

 

I would agree with that. A view of upperparts is the better to tell apart from juv Fantailed Cuckoo. The tail shape & strong markings fits juvenile Brush Cuckoo better than juv Fantailed Cuckoo. I wonder if that is a this spring young already.

 

 

-----Original Message-----
From: Rob Geraghty [m("yahoo.com","the_harper");">]
Sent: Friday, 6 December 2013 8:51 PM
To: Canberrabirds
Subject: [canberrabirds] Juvenile Brush Cuckoo?

I saw this Cuckoo this evening at Farrer Ridge. I think it's a juvenile Brush Cuckoo?

 

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