Normal? No.
Will it get worse? Yes
Bird poop? No, but good try on their part!

Cause? Poor care, poor paint, acid rain, (and the list goes on.) If it
is not too bad, you may (*MAY*) be able to use polishing compound on
it, then rewax the entire car. A good wax (not spray on, wash on, in
the soap on, easy on, but good rub it on, rub it off) job, every three
months (or more often if possible) will help make sure this doesn't
happen.

What to do? You should have done something *before* you bought the
car! Didn't you look at it? Was the damage hidden? Best fix would be
if it was hidden (intentionally, which is unlikely) get the dealer to
repaint the car. However, I suspect you just didn't look hard enough,
and it is your problem. The car is four or five years old now, was not
expensive when new, and probably not worth repainting (a good paint
job would be several thousand dollars, a cheap paint job would look
worse than what you have now... <g>) Buff it lightly, good wax
(Mothers, for example) and realize it is not new..