The Other Whale Who Killed His Trainer

"The first attack occurred in September 1998, when [orca] Keto was only three-years-old." Should this, as well as the three other known attacks by Keto towards his trainers, have acted as a warning that it was only a matter of time before somebody died? 

http://www.onegreenplanet.org/animalsandnature/keto-the-other-whale-who-killed-his-trainer/

Photo: c. Sam Lipman 

Photo: c. Sam Lipman