I think you may be misinterpreting the question Pete.  I think the question
regards the ability for bees to determine "net return" on a nectar source,
ie. forsaking a sugar rich source that is far away for a lesser source
close by.  Energy spent flying to the distant, rich source may exceed the
overall yield vs. flying a short distance for a cheap sugar buzz.  I know
Tom talks about this.  It's one of the most fascinating things I find about
honey bees!

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