House sparrows are some of the birds that North American birders most reliably detest. They are an invasive species, introduced from Europe, with a tendency to take over any nesting cavity that they'll fit into. If another songbird is nesting there, they'll push it out. They also love to nest in the kind of nooks and crannies that tend to form on aging wooden buildings, and when they're there, they make a lot of noise and mess.
Now Birdwatching Canada has another reason for people to dislike the birds They can be arsonists.
Photo from the National Park Service.