The everyday behavior of whales is particularly difficult to study because introducing novel stimuli, such as divers or submarines, into the whales' environment causes whales to behave in unusual ways  Some biologists plan to train sea lions to carry video cameras on their backs and, on command, to swim along with whales
They argue that since whales are accustomed to there being sea lions nearby, using the sea lions to film the whales would allow biologists to study the everyday behavior of the whales
The trained sea lions will not be aware that they are carrying video cameras on their backs.