Rodents

85% of animals used in medical research in 2001 were
rats, mice and other rodents. This percentage will probably
increase as the mouse is the favoured animal model for
research into the function of human genes and the role
genes play in disease.
Rodents, like all vertebrates taking part in research
programmes in the UK, are protected by the Animals (Scientific
Procedures) Act 1986 and there are strict codes of practice
governing their housing and welfare.