The rat tail contains a dorsal vein ... Collecting blood from rodents: a discussion by the Laboratory Animal Refinement and Enrichment Forum. Anim. Technol. Welf. 4(2), 99–102 (2005).

Rats are generally larger, with robust bodies and long tails, while mice are smaller and have more slender bodies and shorter tails. Behaviorally, rats are known for their cautious nature and ...