Dolphins learn from their peers to use empty shells to catch fish

This article discusses peer (“horizontal”) learning of the technique. They distinguish this from parent-child (“vertical”) learning and older-younger non-parental (“oblique”) learning.

Certainly protection of pods is important in this case as well, but the interesting thing here is not the fact that the behavior is learned, but that it is learned from a peer. Evidently this is the first such finding in toothed whales.

There was an interlude in Women's Work: The First 20,000 Years about reconstruction of early societies by their vocabulary, using reconstructed root words from Uralic:

"So we can imagine them sitting around the campfire of an evening in larger groups, making and mending tools and wraps while they swapped interesting stories of their adventures, of their friends or comrades and of the women's suitors. Sometimes people would wrangle, admonish, or curse and sometimes get high. But they also knew how to give presents and distribute goods."

I'm pretty sure female dolphins have suitors, and these friends or comrades are said to get high. Do dolphins give presents?

https://www.nationalgeographic.com/news/2017/10/dolphins-sex...

Do you even shell, pod-mate?

We'd need to invent some sort of ink that worked underwater first.