Magpie aggression to Crested Pigeons

["Tom and Mandy Wilson" <>]

Hi all
as I was out walking this morning, I saw a Magpie dive bomb 3 Crested 
Pigeons - but it did not attack me or the chap I saw with a dog, which I 
would assume were more threatening.  I couldn't see any fledglings, so why 
would a Magpie see Crested Pigeons as a threat?
Cheers
Tom Wilson

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