Steward's book is an attempt to reorient the discussion of free will. Traditionally, the question has been what kind of freedom is required for moral responsibility, and the focus has been on humans. There has been little discussion of the freedom of such things as sharks and bats. One might defend this restriction on the ground that nonhuman animals do not have the kind of freedom required for moral responsibility. If that is the kind of freedom that ultimately interests us, the thought goes, then we can restrict our attention to humans.

But Steward detects a bad argument here. Even if nonhuman animals are not candidates for moral responsibility, they may have a kind of freedom that is required for moral responsibility. A morally responsible agent must after all be an agent. And agency, she argues, extends well down the ladder of nature, vanishing...

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