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

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.