And unfortunately, it isn't a harmless quirk of captivity, either; this frequent floating can actually be dangerous for the whales. SeaWorld's whales often suffer from severe sunburn since they spend so much time floating in the sun, and at least two orcas have died from mosquito-born illness, which they never would have encountered in the depths of the ocean.
But worst of all, their large bodies are built for constant movement, Rose said, and the floating behavior means that many of SeaWorld's orcas are far less fit than their wild counterparts - which isn't good for their physical or mental health.
"They're the ultimate couch potato," Rose explained. "When you talk to some of the trainers when they aren't being watched by their supervisors or their bosses, they'll tell you, 'Yeah, these whales are out of shape.'"
So once again, SeaWorld's distorting the truth to hide the sad reality of their captive orca program from the public.
"[Tilikum and his companions are] doing something that's not natural," Rose said.
You can watch SeaWorld's misleading video below - and click here to read about some of the other problems with it.