Nancy Castaldo is an environmental author and educator whose work focuses on nature, wildlife, and human connections to the natural world. She is the author of *Squirrel: How a Backyard Forager Shapes Our World*, published by Island Press in 2025, which explores the ecological role of squirrels, their adaptability, and their interactions with human environments. Castaldo’s writing draws on scientific research, field observations, and ecological history to illuminate how a familiar animal influences ecosystems, seed dispersal, and cultural perceptions of wildlife. She has written numerous books and articles for young readers and adults on environmental science, conservation, and animal behavior, and speaks regularly at schools, conferences, and literary events. Castaldo continues to publish and advocate for nature literacy and ecological awareness through her books and public engagement.