Friday is that moment between “This week was soooooo lazy” and the mad look that you have when you think about weekend and two free days to do milllllllllions of things. (and you will not do it anyway)
Whale vocalization is probably the most complex in the animal kingdom.
Whales occupying the same geographical areas tend to sing similar songs, whales from non-overlapping regions sing entirely different songs.
The song evolves, it appears that old patterns are not revisited.
Humpback whales perform these vocalizations only during the mating season. Although the end is easy to understand, the function of this song is unknown.