setiinstitute, https://www.giantfreakinrobot.com/sci/scientists-speak-humpback-whale-experiment.html
Scientists on the Whale-SETI team have successfully communicated with a humpback whale named Twain, having a 20-minute “conversation” with the aquatic animal. This historic experiment involved a recorded whale call that the team played into the ocean using an underwater speaker, which led Twain to circle their boat and respond using a “greeting signal.” The exchange lasted for 20 minutes, and Twain would match the interval variations from the team’s calls.
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