by 
The Curious Bag
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<h4 class="dechead">On One Hand: If Maintained, Bird Feeders Are Safe
If they're free of sharp edges, squirrel-proofed, kept clean and hung in an open space, away from hedging and windows, bird feeders should be perfectly safe for both you and your feathered friends.
On the Other: Don't Let Them Go to the Birds
There are a number of dangers to be aware of if your bird house or feeder isn't properly maintained. Uncleaned food droppings and waste can lead to disease among birds that visit your feeder; sharp edges on a bird house are unsafe for children and can cause scratches, allowing viruses and bacteria to infect them; and careless placement can make it easier for cats and other animals to invade the feeder.
Bottom Line
Bird feeders aren't safe in all circumstances. They do require a fair amount of care and maintenance to ensure that you and the local bird population are protected.
Source:
Ozaukee, Wisconsin, Land & Water Management: Is Your Bird Feeder Safe?
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