There is some interesting information out there on the web:
http://wildlife.pr.erau.edu/Bash90-03.pdf
http://www.davvl.de/Volu%20englisch/2003/Wiede.pdf
The first link identifies the types of birds involved and shows that a lot are bigger than our "super new" 1 kg certification requirement.
Interestingly there were about 5,794 reported birdstrikes in the USA in 2003 and it is estimated that 80% of all birdstrikes go unreported. I won't work out the estimated total number as Nick says I can't count!
For plank wing and helos approximately:
18% hit the windscreen
16% hit the engines
14% hit the wing/main rotor
2% hit the tail
g33