Re: Dollarbird now at Booragoon Lake Perth WA

To: "Greg & Val Clancy" <>
Subject: Re: Dollarbird now at Booragoon Lake Perth WA
From: Frank O'Connor <>
Date: Tue, 10 Jun 2008 12:31:26 +0800
At 08:24 AM 10/06/2008, Greg & Val Clancy wrote:
I am curious to know why you believe that the Dollarbird is a 'sub-adult'? It look like a juvenile to me. I suppose it depends upon what your definition off sub-adult is. Certainly a juvenile is a 'sub-adult' if you call anything younger than an adult a 'sub-adult' but I don't. I usually reserve the term for a bird that is close to assuming full adult plumage, i.e. a late stage immature.

A juvenile bird is one that is still in the plumage that it had when it left the nest.

A juvenile Dollarbird has a black bill. This base of the bill on this bird has started to attain adult colour. The head of a juvenile is darker. This bird has a brown head very close to adult plumage. A juvenile doesn't have the blue on the lower throat / upper breast. This bird has adult plumage here. This bird has more advanced plumage even than 'immatures' illustrated in several texts. So it is older than immature, but not fully adult. i.e. it is a late stage immature. Ron Johnstone at the WA Museum agrees.

Frank O'Connor           Birding WA
Phone : (08) 9386 5694 Email : ===============================

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