Lab Mouse Welfare and Housing Enrichment

Mice are the most widely used laboratory animals globally. Simple environmental enrichment dramatically improves welfare without compromising research validity.

Key Facts

Approximately 100 million mice are used in biomedical research annually worldwide
Standard housing in barren plastic boxes prevents natural burrowing, nesting, and climbing behaviors
Nest material provision reduces stress hormones and improves reproductive outcomes in research mice
Tube tunnels and hut structures provide hiding and shelter, reducing anxiety-related behaviors
Enriched housing does not compromise most research outcomes and may improve data quality through reduced chronic stress

Welfare Considerations

Laboratory mouse welfare is a tractable, high-scale welfare problem with well-documented solutions. The evidence that enrichment improves welfare without compromising research is robust, yet implementation lags behind knowledge. Regulatory requirements for environmental enrichment are improving globally, but monitoring and enforcement remain inconsistent.

What You Can Do

Support organizations advocating for improved laboratory mouse housing standards globally
Advocate for 3Rs principles in research funding requirements and ethics committee mandates
Choose personal care products from companies using non-animal testing methods
Learn about laboratory animal welfare science to inform more effective advocacy