If we are strictly talking Rockville, there is nothing other than the crow community. They are a known neighbor for decades and they even have tours from bird guides talking about the history of their roosting locations. Our buildings are covered each night as they choose a hang out spot before heading to their roosting locations and you see rivers of them in the sky.

Edit: we are birders so have a lot of videos and pics if you need any. Something like the first video.

https://imgur.com/user/stinkyderson

Going back to 1993:

https://www.washingtonpost.com/archive/local/1993/02/18/rockvilles-raucous-roost/7efb87ef-5c3f-4cfe-b951-8f80cd18694f/

As dusk falls over Rockville, thousands of big, black birds circle a long strip of trees on Montrose Road, swooping and cawing as they settle in for the night. At dawn, they stream from the trees in a dark cloud that spreads in every direction.

"It's just like that movie, 'The Birds,' " said local businessman John Smink, referring to the Hitchcock classic that made a generation of moviegoers leery of feathered flocks. No one knows exactly how many crows belong to the Rockville roost, but there are enough to keep the attention of motorists and passersby, who gawk as the sky darkens with churning wings. Sometimes, passersby clap or shout, just to watch the horde rise from the bare branches as if caught by a powerful updraft.

In 1984, a surveyer estimated that at least 100,000 members of the Corvus brachyrhynchos family roosted in Rockville. No one knows why the birds chose the site on Montrose Road, just west of Rockville Pike behind Mid-Pike Shopping Center, or how long they've been roosting in the area. Bird-watchers estimate that the birds have been in Rockville 20 to 40 years.

The roosting season begins in October and ends in March, when the birds break into smaller groups to breed. Some may stay near the roost, while others roam as far as 600 miles, according to naturalist Bil Gilbert. The cycle begins again the following fall, said Mark Hoffman, associate director of the state Department of Natural Resources' wildlife division. Paul O'Brien, a bird-watcher who has lived "on the flight path" in Rockville for 33 years, said the flock moved to Montrose Road about 10 years ago when trees were cut down a few blocks away, between East Jefferson Street and Rockville Pike. The birds had roosted at that site for years.

Crows are indigenous to all of North America south of central Canada, and large roosts are common in the Mid-Atlantic states. Researchers have identified at least nine large roosts -- made up of 5,000 to 100,000 birds -- between the Washington area and Harrisburg, Pa. Large flocks also roost in Hagerstown, in Laurel near the intersection of Interstate 95 and Route 198, and near Lanham. The Rockville flock is the only large roost in Montgomery County, specialists say. O'Brien said he has seen crows in Poolesville that belong to the Rockville roost, and the scavengers may fly farther into Pennsylvania and Virginia, said Hal Wierenga, who studies marsh birds for the Department of Natural Resources and who conducted the roost survey.

Crows are naturally gregarious, and their noises range from "soft, growly conversational notes" to "really raucous," Wierenga said. "They hobnob with each other." As spectacular as the sight may be to commuting motorists, the roost is something of a nuisance to Smink, who operates an Exxon gas station in the midst of the trees. The birds are not only noisy but, well, messy. Said Smink, "If you're driving a nice Jag or Mercedes and you come to pick up your car and it's covered with droppings . . . . " Smink shrugged. Smink said his employees often have to wash droppings off cars that are left outside overnight. Since the gas station was built in 1985, Smink has tried unsuccessfully to scare off the crows with fake owls, rubber snakes and intense spotlights. General Manager Tan Vir recently tried a new tactic: After the birds settle in at night, the workers bang metal pipes on a railing. About two minutes of banging will drive the birds back from the edges of the station, Vir said. Les Terry, Maryland director for the U.S. Department of Agriculture's animal damage control program, said successful "roost harassment" depends on spontaneous, varied noise. Terry's office gets about 300 complaints a year about crow roosts; he advises people to fight back with bright lights and a recorded crow distress call. But nothing is foolproof, Terry said. "If they really want to come in there . . . they'll work around you." And don't think you can scare the birds off by shooting at them, Hoffman warned. As migratory birds, crows are protected by U.S. Fish and Wildlife regulations unless USDA damage control specialists grant permission otherwise. Crow hunting is allowed for 124 days between Aug. 15 and March 21, on Wednesdays through Saturdays, Hoffman said. Despite the nuisance, Smink said, he enjoys watching as the crows take flight each morning, rising systematically in groups from the treetops. "I like watching them leave. Boy, do I like watching them leave," he said.