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Porpoise Or Dolphin 
T. Orr
Some animals look so alike, it's difficult to tell which is which! The Porpoise or Dolphin book in the Which Is Which? series helps readers discover the similarities and differences between porpoises and dolphins. Focused on 21st Century content, the Which Is Which? series encourages readers to ask questions, think more critically and creatively, and use their problem-solving skills. Gr. 2-5
