What with being cooped up (geddit?) or hermetically sealed in a lorry with all the hot air, feathers, eggs, chicken/pigeon/pidegon poop and my tendancy towards travel sickness - if I were a chicken, this would seem like a damn good reason to cross the road !
If the lorry's sealed then there is no weight loss from exertion. The waste products still being contained.
The pidgeons have to create a down force at least as great as their own mass.
Sooooo the truck will weigh the same.
Now I'll go look at the new scientist article.
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