A Humpback Whale rolls to curiously observe a freediver. Humpback Whales are extremely intelligent and males can even sing complex songs to try impress a female. These songs differ from standard whale vocal communication. Songs are composed of several noises that form structured phrases which are repeated over and over (similar to the song structures which humans create). Most songs last anywhere from 30 minutes to a couple of hours however, the longest recorded song was 22 hours... That male would've surely impressed a female with that effort.