either the animal is a mammal but not a platypus, or it is a platypus. In the first case the conclusion is true; in the second, it would be false if the platypus were female. But of course it is highly unlikely that the boy next door keeps a platypus, since very few if any are kept as pets. So the first situation is highly probable if the premises are true. Therefore if we add the premise that it is highly unlikely that the animal is a platypus, the argument is inductively forceful (to a high degree). Making this explicit, we get:

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