http://www.springerlink.com/content/g462245897502720/

This states the world's population of birds is between 200 and 400 billion.

That's say 300x1000000x1000000 or 300,000,000,000,000 birds. Let's just say that each bird only craps 1 gm of birdshit a day (considering the size of many birds, it's a conservative estimate).

Each metric tonne is 1,000 kg or 1,000,000 gms. That means then that birds crap approximately 300 million metric tonnes of shit hit the ground everyday.

Now we get to the point:

Of that 300 million metric tonnes, most of it seems to hit my car - that or it's personal.

Yo cats - eat as many of our feathered brethren as you can!!! Oh, and drink water by whatever means to want afterwards.