Many homeowners might have an unexpected neighbour in their chimney.Chimney swifts, as their name suggests, have adapted to make their nests in old chimneys. Their population has declined 90 per cent since 1970, placing them at significant risk of being listed as endangered.To help keep track of swift populations, Birds Canada has a citizen science project called SwiftWatch, which BirdFriendly Kitchener is a partner of.“It’s a national program, …