Another great question. I guess no one knows for sure what they are doing. The males do spend a lot of time chasing females in the warm southern waters where they are not eating. Even here in Bermuda, on their way up north, the boys seem to spend a lot of time chasing after the girls, showing off by breaching, pectoral fin slapping, tail lobbing. They also spend a lot of time singing and communicating. Sometimes I think humpbacks are also just having a lot of fun. They are such good swimmers I think they might breach and tail lob sometimes just because they can! In that way, they are much like us. We eat, sleep, hang out together, play and have fun.