What is the giant sloth in journey to the river sea?

In "Journey to the River Sea" by Eva Ibbotson, the giant sloth refers to a prehistoric creature that is mentioned in the context of the Amazon rainforest. It symbolizes the wonders and mysteries of the natural world that the protagonist, Maia, encounters during her journey. The mention of the giant sloth highlights the themes of exploration and the rich biodiversity of the Amazon, contrasting with the challenges and adventures faced by the characters.