I was surprised to find mice in the Chinese space program. The Chinese are intentionally sending 4 mice to the Tiangong space station and plan to return the rodents to earth on a spaceship.

NASA also has a rodent research program.

---

Sources

https://english.news.cn/20251030/fbad831fe37046d184dd7e82e4a35fd0/c.html

https://www.nasa.gov/centers-and-facilities/ames/ames-science/ames-space-biosciences/rodent-research/