This link led to only one main text article, but it referenced the scientific classification "Ornithorhynchus anatinus." By clicking on this, the researcher is led to much more information and subcategories related to science and evolution of such mammals.
Yes, World Book Student has much more info than Kids. Notice that you can search Student, Student+Kids, or Media. We think the Student+Kids option is nice for those students who are in-between in ability. You might like to try Student's Timelines, Trivia Quizzes, and Surf the Ages.
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