True - but then http://pages.cthome.net/rwinkler/survey.htm indicates that
about 1 in 6 US citizens are birders (much higher than the UK %age) and of
course many European countries have good numbers of birders. And given that
not all UK birders would belong to the RSPB (and that the definition of a
border is debatable) I reckon the numbers are as good as any you are likely
to get short of running a survey of departing passengers!
2008/5/24 Andrew Wood <>:
>
> Elegant as Andrew's calculation to substantiate the 4 birdwatchers per
> plane theory is, it assumes that all the people on planes leaving Heathrow
> are British, or of nationalities which have the same proportion of
> birdwatchers amongst their populations as the British.
> Given that the British are probably exceptionally "birdy", I fear that four
> is a bit generous. Sorry to spoil the fun, but I suspect Sean may have had a
> reason for asking!
>
> Andy Wood
>
>
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