Essential cinnamon oil
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Is Cinnamon A Good Pest Repellent For Your Bird Bath?
By JACQUELINE DELIBES
Adding a few drops of cinnamon oil to your bird bath works well as a pest and insect repellent around water because the smell repels mosquitoes while the oil kills larvae.
However, it's possible that adding cinnamon oil to your birdbath may prevent birds from visiting your yard, since they dislike the smell of this particular spice.
While you risk deterring some birds, sources agree that cinnamon is safe in small doses, so there is no need to worry about harming the birds who visit your bird bath.