As birds feathers don't normally change in this way, it sounds as if you
may have Greenfinches in your garden, or some other type of finch.
Have you got a bird field guide? If not, I strongly recommend you borow
one from a library (or, better still, get yourself one for Christmas!).
You can then look up the exact colours and identifying markings on House
Sparrows and Green Finches, and compare them with your birds. Could
they be escaped canaries? Some varieties look a lot like sparrows.
Have you got a pair of binoculars? As Jon Wren pointed out on this
mailing list, they are "magic" - they open up a whole new world of birds
in their natural environment. If you haven't got some you can buy an
adequate pair for about $70 and you'll never regret it!
Atriplex Services: "Working With Nature" Environmental Consultants,
Growers of native Australian plants, educators.
Visit our Native Plant Nursery at "Fiddlers' Green"
Blanchetown Road, Morgan, South Australia.
Birding-Aus is on the Web at
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