Below is a book review. Classify the book into one of the following genres based on the review, and explain why: Autobiography, Fantasy, History, Mystery

Very unusual world. An island of predator species, not just mammals and birds and reptiles but also carnivorous plants - and more, which I won't give away. Not for squeamish readers, but there is an engaging hero and lots of other characters who also attract the reader's sympathies. I would not recommend it to very young readers despite its young protagonists because it has a 'Nature red in tooth and claw' matter-of-factness that I myself found upsetting.
I gave it 5 stars because the story ends in a satisfactory way and doesn't require a sequel, though the author mentioned she was writing more stories about these characters.
Based on the review, this book belongs to the Fantasy genre as it seems to be set in an otherworld with fictional predators.