In the 1970s, scientists at Fermilab employed a ferret named Felicia to assist with cleaning vacuum tubes in the Meson Laboratory.
More:
https://history.fnal.gov/historical/...icia_tiny.html
Previously:
Lab rat chamber - photo
Lab rat anesthesia rig - photo
Scientists train rats to drive tiny cars - photo and video
Coal mine canary reviving chamber - photo
Lab rat chamber - photo
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