4 years & up. This set of books provide engaging and educational content for young children interested in learning more about birds, mammals, insects, and reptiles. They encourage curiosity, exploration, and appreciation for the natural world while promoting early literacy skills. These books clearly describe how animals look, where they live, what they eat, how they defend themselves, and how they care for their young. Learning about animals' behaviors, needs and habitats promotes empathy and compassion. These books provide opportunities to connect what they read to their own experiences and observations. Written in both English and Spanish, these are great books for bilingual learners. Set of 4.