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About One and Only
The One and Only is a series of middle-grade novels written by Katherine Applegate and illustrated by Patricia Castelao. The series consists of four books: The One and Only Ivan (2012), The One and Only Bob (2020), The One and Only Ruby (2023) and The One and Only Family (2024). The books are inspired by the real-life story of a gorilla named Ivan and center on themes of friendship, empathy and animal welfare.
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