Their difference is one of size.

    Upon this cake of ice is perched,

    The paddle-footed Puffin:

    To find his double we have searched,

    But have discovered—Nuffin!

    Not every one is always able

    To recognize a vegetable,

    For some are guided by tradition,

    While others use their intuition,

    And even I make no pretense

    Of having more than common sense;

    Indeed these strange homologies

    Are in most flornithologies,

    And I have freely drawn upon

    The works of Gray and Audubon,

    Avoiding though the frequent blunders

    Of those who study Nature's wonders.
   

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