Passage Summary: Because Kodiak bears are physically built to walk upright, the author assumes they must do it by instinct rather than having to learn how.

Conclusion: Walking on hind legs is an instinctive behavior for Kodiak bears rather than a learned one.

Reasoning: The physical shape of Kodiak bear hip and foot bones makes standing and walking upright a completely natural behavior for the species.

Analysis: This argument falls into a classic 'nature versus nurture' trap. The author assumes that because a body is physically capable of a movement (it's 'natural'), the knowledge of how to perform that movement must be 'instinctive.' However, being physically built for a task doesn't mean you don't have to learn it. Humans are physically built to walk, but we still have to spend months learning how to do it as toddlers. Look for an answer that points out this failure to distinguish between physical capacity and innate behavior.