Passage Summary: Scientists want to film whales using sea lions as 'cameramen' because whales are used to sea lions and won't get spooked or act weird.

Conclusion: Using sea lions to film whales will allow biologists to observe their natural, everyday behavior.

Reasoning: Whales are accustomed to sea lions, unlike divers or submarines which are novel stimuli that cause unusual behavior.

Analysis: The argument hinges on the idea that the camera won't ruin the disguise. Even if whales are cool with sea lions, will they be cool with sea lions wearing bulky electronic backpacks? We need to assume that the addition of the camera doesn't turn the familiar sea lion into a 'novel stimulus' itself. Look for an answer that ensures the equipment or the sea lion's behavior doesn't tip off the whales that something is different.