After lining-up on a runway a few days ago, we noticed a bird (a crow, to be precise) walking around on the centreline about 50 yards away. I turned on the weather radar and bombarded the little sod with loads of radiowaves. I can report that absolutely nothing happened. The bird carried on with normal bird ops (ie. walking about and looking for food) for the next minute until we received T/O clearance. Only when we spooled-up and it heard our engine noise did it fly away.
Result of investigation, weather radar doesn't scare birds away.
QED
p.s. Maybe we need a bigger sample size ie. a flock.