Hi David
What a fascinating topic!
I'll be the first to stick my neck out and estimate ....
Grey Falcon: just one - it flies in random directions across the
continent trying to avoid birders
Lewin's Rail: not many, perhaps a dozen or so - less mobile than the Grey
Falcon of course, and move in and out of reed beds trying to avoid me.
Australian Magpie: Not sure about this one - I'm still counting ....
Russell
PS Seriously now - does anyone know of any areas where Red Wattlebirds,
Noisy Miners and Crested Pigeons have declined over the last decade or
two? These may well be the survivors as we move towards a birding
"monoculture".
On Wed, October 10, 2007 10:38 pm, david taylor wrote:
> I'm reading an interesting book at the moment and it prompted a
> question.
>
> i wondered just how many birds there are in say Australia or on
> planet earth. I'm talking total numbers rather than species. i
> googled and read a couple of interesting pieces on the subject
> including some research from Gaston and Blackburn which suggests
> there are between 200 and 400 billion birds on earth! Wow! Another
> study estimated 100 billion plus birds on earth. In comparison there
> are around 6.6 billion people on earth, so our avian friends well and
> truly outnumber us.
>
> i wondered if there was any data/estimates on the total number of
> birds in Australia?
>
> Also I pondered on some of our more common species - say the Magpie
> which has a very wide distribution across the nation - I wondered
> just how many it may be estimated are in Australia?
>
> Or perhaps what are our most abundant species in terms of total numbers.
>
> Thought it might open up some interesting discussion, estimates ( or
> guesstimates! ) data or research info that may have been done.
>
> cheers,
>
> David Taylor
> Brisbane
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Russell Woodford
Learning Technologies Coordinator
Sacred Heart College Geelong
http://web.shc.melb.catholic.edu.au/music/auralonline.html
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