April 5, 2023 / 5:19 AM PDT / CBS Sacramento A squirrel who visited a UC Berkeley microbiology lab has learned to ring a bell for service. Researchers befriended this little guy by feeding him ...

The students at a Berkeley microbiology lab trained the squirrel by making the bell ring whenever he begged for food, and if he happened to strike the string waving his paws, he got a nut.