why are crows regurgitating beside my pool?

I have a pair of crows that are dumping at least 25 disgusting white blobs around my pool. I've tried many different things to scare them away but nothing is working. HELP!

Answers:
Birds feed their young by regurgitating food back to them. Is it possible they have a nest nearby? Do their chicks come by and eat it?

Sounds gross, but we're not crows.

Other answers:
They got a good look at you.
They got a good look at you.
Because you would get mad if they did it by your bathtub.
It's probably because you forgot to take down the sign that says "barf here"
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