It is correct - It is said that birds "feel" weather radar signals.
Apparently, it makes bird uncomfortable, scares them, and makes them "takeoff".
So, there are those airlines with a policy "operate your radar" to chase birds.
Then other airlines who say "no radar", as they will fly... into your engines.
xxx
At PanAm, we once had an ornithologist lecturing a few instructors.
He said that birds takeoff agaist the wind, exactly like airplanes do.
You see - birds study second segment performance better than some of you guys.
Runway 09, wind from the North, birds on South side, they will takeoff in your path.
xxx
Exact science...? - Or just "for the birds"...?
Once took off with a 747, got a (few) big ones in nš 4. Lucky was only one engine.
They had discounts on chicken dinners at the airport restaurant that evening.
xxx
Happy contrails