[notduncansmith]

Bees are super cool, but [2] doesn’t say a glass wall, but describes a more physically-involved process.

From that link:

> A bee lands beside another one who had already pulled a string for reward, gaining the reward without pulling herself/himself.

> The observer learns to associate the other bee with reward and typically begins following her/him around, keeping in close contact as they walk.

> The observing bee would be in direct contact with the string-pulling bee throughout the pull, usually not touching the string, although sometimes ineffectively manipulating the string herself/himself as well, and ultimately gaining reward through the other bee’s efforts.

> The learners progressively change their foraging behaviors from observers to competent string pullers.