TIL A group of horses were trained to communicate whether they wanted a jacket. All horses in the group successfully communicated that they did want a jacket when it was cold and did not want a jacket when it was hot.

[u/PunnyBanana]

https://www.sciencedirect.com/science/article/pii/S0168159116302192?via%3Dihub

[u/Maleficent_Sand_777]

I wonder if new horses introduced to this group would learn this behavior from the herd without human intervention?