Why So Many Crashes of Bee-Carrying Trucks?

Well, a bee weighs between 90 and 180mg [answers.com], I'll just assume 100mg on average. That makes for a combined weight of 25M*0.1g = 2.5Mg = 2.5t

When all 25 million bees take of, they reduce the lorry's weight by 2.5 tonnes? Whoa.

But wait! The lorry is closed at the bottom,/me guesses. Air cant escape downward (maybe to the sides or upward?). -- So, no.
No change in weight after all, as the downward pressure from their wings should equal their mass as they hover around

Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/VSI8Z7nWwzA/why-so-many-crashes-of-bee-carrying-trucks

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