The two most common nuisance bird species are starlings and english sparrows. Both species would rather nest in man made structures then trees. Very often they will nest in the duct work leading from the hood over your stove to the vent outside. If the nest is located close to the out side vent it can be easily removed. If the nest is further down the duct it may be necessary to install wire large enough to allow the adults to feed the young, so they can eventually leave on their own. This will prevent young from dying far back in the duct work where they cannot be removed.