They provide food and shelter for many birds throughout the year. Never feed wildlife. Natural diets are always more nutritious for wildlife than human food. Bird feeders can be stocked with balanced mixes of different seed, appropriate for the birds in your area. Old bakery goods do not supply nutritional levels for good health, especially when birds are preparing for migration or breeding.
Many birds depend on insects in and around our backyards.
So, limiting the use of insecticides can help protect the health of our wildlife and water resources too. Instead of using dangerous chemicals, contact local conservation groups to obtain ideas for environmentally safe alternatives. You can try supplying a nest box for them to use. Your local Audubon Society can provide you with instructions. Reflections from windows can confuse birds.