In May 2021 Hakai Magazine published a five-episode mini podcast called The Sound Aquatic. While our team has a break over the holidays, we’re bringing you that series. Here’s the fourth episode, “Learning to Speak Whale.” “Culture” is a tricky thing to define—anthropologists still don’t totally agree what comes under its umbrella. But by any measure, it’s getting clearer and clearer that humans aren’t the only ones who have it. And below the waves you’ll find some of the most famous and mysterious nonhuman cultures of all. Find show notes and a transcript at hakaimagazine.com/the-sound-aquatic.