4th Science teaser

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My laundry was recently spattered with ‘little messages’ from a local band of marauding blackbirds. My first question was ‘Why do they have such a good aim, hitting only my washing?’ Then I got to thinking, if these birds eat little black insects, worms, occasional seeds, bread etc, why are their droppings white?

So, can you tell me why bird droppings are the colour they are?

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