Bluebirds have several different predators. If you want your bluebirds to thrive, predator control is an important factor. Among the predators are:

• Snakes
• Raccoons
• Cats
• Birds of prey
• House Sparrows
• House Wrens
• European Starlings

Here is some great information on detecting predators and some great tips on how to prevent them from hurting or killing your bluebirds.