Wildlife Welfare

Wild Marsh Tit Nest Box Advanced

Unlike most tit species, marsh tits rarely use standard nest boxes with 25-28mm entrance holes. Research into appropriate nest box design is enabling supplementary provision that benefits this declining species.

Key Facts

Marsh tits require 25mm entrance hole boxes but accept them less frequently than blue and great tits
Competition from other tit species for available boxes disadvantages marsh tits
Dedicated marsh tit boxes with smaller entrance holes reduce competition from larger species
Marsh tit territories are small and stable enabling year-round habitat monitoring
UK marsh tit population has declined by 70% since 1970 making nest box provision increasingly important

Welfare Considerations

Marsh tits that encounter appropriate nest boxes show higher breeding success than those dependent on increasingly scarce natural tree cavities. Targeted nest box provision in marsh tit habitat, using entrance hole sizes that favour marsh tits over competitor species, directly improves individual breeding welfare and population productivity in this declining woodland specialist.

What You Can Do

Install 25mm entrance hole nest boxes in suitable woodland habitat
Contact local wildlife trusts about marsh tit-specific nest box programmes
Report marsh tit nest box use to contribute to monitoring data