"Occasionally, a group of whales will leave their winter waters in the middle of a song, and six months later they'll return and pick the song up at precisely the spot that they left it off, beat for beat, measure for measure, sound for sound."
"...If i imagine that the songs of a humpback whale are sung in a tonal language, then the number of bits of information in one song is about the same as the information content of The Iliad, or The Odyssey."
-Carl Sagan's Cosmos