American Girl: Lea #2: Lea Leads the Way book by Lisa Yee

Lea is all set for an animal-discovery adventure! She's never been to a rainforest before, and her mind is filled with exciting thoughts about the animals she'll get to see - and the pictures she'll get to take deep in the jungle. During a hike with her brother through the Amazon rainforest, they discover a baby sloth that is badly injured. Lea quickly decides she must do all she can to help the little sloth survive. But as she learns more, she wonders: "Is that the right thing to do?"