patrickhadfield, 
"Sperm whale clicks could be the closest thing to a human language yet.
An analysis of thousands of exchanges between sperm whales suggests they combine short click patterns into longer sequences that could convey a wide range of meanings"
https://www.newscientist.com/article/2429941-sperm-whale-clicks-could-be-the-closest-thing-to-a-human-language-yet/
