ALBANY, N.Y. -- The crows came in squawking, crowding treetops and leaving a mess below -- a jet-black air force invading the city for another night. But this time Ken Preusser was there. He blared a ...

All those swarms of crows that bedevil Lancaster city and its suburbs each winter - they're from Canada, eh. That's one of the tidbits emerging halfway through a two-year study into the invading birds ...