Final answer:
In the book 'Wonder,' Eddie is the kid who makes fun of August at the nature reserve.
Step-by-step explanation:
In the book Wonder, the kid that was making fun of August at the nature reserve was named Eddie. August experienced bullying and teasing from Eddie when he went on the school trip to the nature reserve, which was a challenging situation for him. This incident is one of many that August faces as he navigates school and social situations with his facial difference.