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I just noticed this topic, Neil.Seeing as nobody else has contributed i will attempt an answer. Birds can and do fly in the rain, their feathers are oily which repels water. Also, their bones are hollow, so they can afford to get a little wet and this will not add too much to their weight.
I've been watching the swallows at the stable yard and they most certainly do fly in heavy rain.
does the cavernous-echo-chamber nature of a Swallows bones replicate itself amongst all birds ?...even Ostriches ?...
Quote from: neilep on 20/08/2007 18:20:08does the cavernous-echo-chamber nature of a Swallows bones replicate itself amongst all birds ?...even Ostriches ?...ermmm, i don't know that one. i just remember the inital answer from school. we were more interested in girls and catching things from toilet seats to worry about ostriches.
i think its wonderful how this topic has spanned the years if any of you were still wondering, though some flightless birds such as penguins and ostriches have solid bones, most birds do have very light, hollow bones.