Dolphins have very complex social behaviour, but this also allows for them to express cruelty rarely seen in nonhuman animals. Some species of dolphins will actually kill and mutilate baby dolphins, including those from their own species. Other types of animals will also attack juveniles to help their own offspring or reproductive chances, but dolphins seem to get much more entertainment from it.
Elephant seals are one of the few mammal species to fully molt layers of skin on a routine basis, rather than just fur.
Dennis Wilson was also once friends with Charles Manson (yes, that Charles Manson), and Manson even wrote a song that was eventually released (with altered lyrics) as a Beach Boys single less than a year before the Manson Family murders.