In Lulu Delacre's Spanish picture book "Rafi and Rosi Piratas!" two tree frog siblings are eager to explore El Morro Fort. Along the way they learn about Puerto Rico's history whilst participating in pirate battles. They learn about the life of Roberto Cofresi, a famous Puerto Rican pirate, and the importance of El Morro Fort in Puerto Rican history. As they go through the fort, they discover some treasure that isn't theirs. After the two decide to turn it in to the museum, they reach a disagreement.
