@manycrows was my first online nickname.
There's a freak occurrence where sometimes crow murders can gather in the thousands. In 1995 this happened in downtown Kansas City. They roosted for the night in the Plaza, seemingly centered on my apartment. They'd wake up just before dawn and start flying off in long rows to wherever they were planning to spend the day, and as they did this, they'd call to each other, and the calls would travel up and down the lengthening rows of birds. From the ground it sounded like this crazy cacaphony of echoes and Doppler effects. I'd wake up with them just to listen. It was an amazing sight too, thousands of crows in the sky. At night when they returned, they would cover every square inch of every tree in the neighborhood. The sidewalks and parked cars were absolutely coated in crow poop. Whole thing really made an impression.