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A good book for conducting this type of explicit lesson is What's the Difference? 10 Animal Look-Alikes by Judy Diehl and David Plumb (2000). This book provides 10 simple, compare-contrast passages about pairs of animals that are similar in appearance (such as alligators and crocodiles). A sample of what a compare-contrast lesson using this book might look like is included in the following vignette.
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