How To Keep Wrens Out Of Bluebird Houses

How to Keep Wrens Out of Bluebird Houses

Wrens are charming little birds, but their nesting habits can sometimes clash with those of bluebirds. Wrens are prolific nesters and often aggressively claim bluebird houses, preventing bluebirds from using them. This can be frustrating for bird enthusiasts hoping to attract bluebirds to their yards. Luckily, there are several effective ways to deter wrens and encourage bluebird occupancy.

Understanding the Problem: Why Wrens Choose Bluebird Houses

Before diving into solutions, it's important to understand why wrens are so attracted to bluebird houses. Their preferred nesting sites are often small, enclosed cavities, and a bluebird house fits the bill perfectly. They're also highly territorial, aggressively defending their chosen nesting site against other birds, including bluebirds.

Wren vs. Bluebird: A Size Comparison

The key difference lies in size. Wrens are significantly smaller than bluebirds. This size difference is the key to most preventative measures.

Effective Strategies to Keep Wrens Away

Here are some proven methods to keep wrens out of your bluebird houses and encourage bluebirds to nest:

1. Smaller Entrance Holes: The Most Effective Method

This is the most effective strategy. Wrens can easily squeeze through smaller openings, but bluebirds will struggle. A 1.5-inch diameter entrance hole is generally recommended. This size allows bluebirds to enter easily while restricting access for wrens. Consider measuring the entrance hole of your current house; if it's larger, you may need to reduce the size.

2. Using a Baffle: Preventing Access From the Top

Wrens are quite adept at climbing. A baffle placed above the entrance hole can prevent them from accessing the house from above. A simple metal cone or a plastic disc will do the trick.

3. Monitor Regularly and Clean Out Nests

Regular monitoring of your bluebird house is crucial. If you find a wren's nest inside, remove it promptly. This removes the existing nest and discourages the wrens from returning. Always check for eggs or young before removing a nest.

4. Strategic House Placement: Location Matters

Placement can play a role. Try to position the house in an open area with good visibility, reducing the likelihood of wrens finding it unnoticed. Additionally, ensure there is ample nearby foraging habitat for bluebirds.

5. Utilizing Wren Houses: A Separate Residence

Consider providing a separate nesting box specifically designed for wrens. This can offer them an alternative nesting spot, potentially reducing the competition for bluebird houses. This strategy is most effective when combined with the other techniques mentioned.

Maintaining a Balance: Coexistence is Possible

While keeping wrens out of bluebird houses might seem like a constant battle, with consistent effort and the right strategies, you can improve the chances of successfully attracting bluebirds to your yard. Remember that respecting all birds is important. Finding a balance that promotes the well-being of both species is a rewarding experience for bird enthusiasts. Happy birdwatching!