Why do birds poo white, and why runny and why whilst they're flying??

WHy dont they just sit on a wee tree branch and perch and do a touch pellet instead of whitey grey ** splat ( usually over my friend)!?
Answers: just because you asked heres adjectives you ever need to know roughly speaking bird poop.

They don't pee. It is mixed. They go when they gotta dance.
I didn't design them.
Be glad cows don't fly.
I don't know Salty, their knees being on backwards baffle me.
And did you know that a bird will fly 5 miles out of his mode just to crap on my vehicle if I wash it.. How do they know?

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