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another difficult question

To:
Subject: another difficult question
From: "John Leonard" <>
Date: Tue, 24 Feb 2004 20:18:25 +0000
Also couldn't resist this difficult question:

Why is it that wherever in the world you are there is likely to be a passerine that lives on stream-sides or near water which is predominantly black and white (possible with grey), which has a comparatively long tail and jerky movements (even though these birds are completely unrelated), eg

Australia: Magpielark
SE Asia: Slaty-backed Forktail
Britain: Pied Wagtail (and various other grey and white or black and white wagtails in Europe and Africa)
Central America: Torrent Tyrannulet

John L

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John Leonard (Dr)


http://www.webone.com.au/~jleonard
PO Box 243, Woden, ACT 2606, Australia
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