Members of a sperm whale family near the Caribbean island of Dominica are part of a clan that’s culturally distinct from others. Each clan communicates in its own dialect of click patterns, like Morse code.

Members of a sperm whale family near the Caribbean island of Dominica are part of a clan that’s culturally distinct from others. Each clan communicates in its own dialect of click patterns, like Morse code. (Photo by Brian Skerry)