Welfare Science

Lab Mouse Enrichment and Three Rs Progress

Enriching the laboratory environment for mice reduces stress, improves research validity, and represents one of the most achievable Three Rs advances.

Key Facts

Standard lab mouse caging often provides nothing but food, water, and bedding
Nest material, huts, and running wheels improve physical and psychological wellbeing
Enriched mice show fewer stress behaviors and more reproducible experimental results
The Three Rs framework (Replace, Reduce, Refine) provides a roadmap for welfare improvement
UK, EU, and US regulations now require environmental enrichment for lab rodents

Welfare Considerations

Environmental enrichment for laboratory mice is both a welfare and a scientific imperative. Animals in more naturalistic conditions are healthier and provide more ecologically valid data, meaning enrichment benefits research outcomes too.

What You Can Do

Support research institutions with robust enrichment programs
Advocate for mandatory enrichment standards in all countries using animals in research
Donate to organizations developing non-animal research alternatives