Hi
It is very true that exposure to electromagnetic engergy is not very good for living beings.
The abillity of wx radar to have any effect on brids at any appriciable distance i find hard to belive. The rules that we adhear to while ground testing the wx radar system are that no one should be infront of the radome or to the side, the Max permissable exposure level to microwave energy is a field strength of 10 milliwats per square centimeter. FAA AC 20-68B
On our Bendix RDR-4B the exposure minimum boundary is 14ft from the scanner. Further than that the field strenght has reduced.
Older A/C have older wx radars and these can be more powerful.
Stu.
CAA Eng.