What does a wren gard look like It goes on bird houses to protect birds from mean birds?

A wren guard is a small, protective barrier attached to birdhouses, designed to deter larger, aggressive bird species from entering and dominating the nesting space. Typically made of wire or mesh, it allows smaller birds, like wrens, to access their homes while keeping out unwelcome intruders. The guard usually covers the entrance hole and provides a safe environment for the nesting birds and their chicks. Its design balances protection with accessibility, ensuring that the intended occupants can thrive.