Crows are smart and no matter what you do, I think the crows are going to do what they want to do. There was a CBC Nature of Things episode about a family of crows, quite interesting ! There is some evidence that we are to blame for this problem, as crows prefer lite areas at night so they can see their main predator, owls. Also, city landscape and urban concreate jungle can actually be warmer than out in rural areas. No one really knows why they pick a particular area and I can sympathize with home-owners that have to deal with crow poop everywhere.

The city of Charlottetown, P.E.I. is taking further steps to solve the crow problem in some neighborhoods.

The city tried a few experiments last year to try and push the crows away from residential areas. But now it's back to the drawing board.

"The crows, they own the neighborhood," said Christine Hoffman, who moved to the Brighton area of Charlottetown nine years ago. "There's tonnes of them. They swarm the trees. And they're really loud in the wee hours of the morning and at dusk. And they make a huge mess."

A year ago, the city tried to tackle the crow problem around Victoria Park by purchasing two high-tech sound machines called whalers that residents could sign out to try to scare the crows away.

Crow problem stymies Charlottetown
http://www.cbc.ca/canada/prince-edward-island/story/2010/11/10/pe-crows-...