9 Birds You’d Rather Not Spot in Your Garden

Unwelcome feathered visitors

A few species are known for aggressive behaviour or harmful effects on local wildlife. Blue jays, for example, are territorial and noisy; they bully smaller birds like chickadees and titmice and can dominate a garden’s bird scene. To deter them, try switching seed to nyjer (favoured by finches), use owl decoys or reflective surfaces, and hang clanging metal wind chimes to mask their noise.

Brown-headed cowbirds are a different problem. They are brood parasites, laying eggs in other species’ nests so those birds raise cowbird chicks instead of their own. Homeowners can discourage cowbirds with tube feeders that exclude larger birds and by avoiding sunflower seeds and millet. Report suspicious nests to programmes like NestWatch (a citizen-science programme run by the Cornell Lab of Ornithology).

Big troublemakers

Canada geese migrate in V formations, but when they settle in gardens they can cause significant damage. They tear up grass and leave droppings that contain harmful bacteria; a single bird can deposit up to 4 pounds of waste each day, and they sometimes gather in flocks of up to 100 geese. Solar-powered flashing amber lights from companies such as Away With Geese are designed to disturb geese while remaining barely noticeable to people.

The common grackle is another problematic species. These large blackbirds nest in colonies that can top 100 birds and will eat and spoil crops such as citrus fruits, melons and corn. Using cage-style feeders, recommended by birding experts Kenn and Kimberly Kaufman, allows smaller birds to feed while keeping grackles out.

Dealing with urban birds

Cooper’s hawks are used in falconry but prey on smaller songbirds such as robins and jays. They have adapted to suburban life, so temporarily removing bird feeders can help scatter smaller birds and reduce hawk activity.

European starlings are considered invasive in the U.S., with more than 220 million birds affecting agriculture and local ecosystems and causing financial losses valued at £640 million a year. They are tough to control, but effective steps include avoiding nesting boxes and suet feeders, using birdhouses with openings smaller than 1½ inches, and rotating deterrents such as decoys or audible devices.

Less obvious nuisances

Often incorrectly called “seagulls”, gulls regularly travel inland looking for food and can be a persistent urban nuisance. Gulls are long-lived, opportunistic and noisy, and can leave a messy trail when they nest in towns. Better waste management (securing garbage bags and using containers with lids) and physical measures such as anti-bird spikes can reduce their presence.

Both house sparrows and pigeons create common problems in rural and suburban areas. Sparrows (a non-native species) gather in large numbers and compete aggressively for food, while pigeons can carry diseases such as Salmonellosis and damage buildings with their droppings. For these species, professional help and careful waste management are recommended.

Knowing each species’ habits and the range of deterrence tactics helps maintain a healthy balance in gardens while respecting legal protections under the Migratory Bird Treaty Act of 1918, which safeguards over 1,000 species across the United States. The problems these birds present show the tension between enjoying wildlife and managing ecological dynamics in our backyards.