Daisy Hildyard explores what she calls the 'second body'—the ecological and planetary body we all share beyond our individual physical selves. Every person exists simultaneously as a bounded organism and as a participant in global systems of carbon, water, and energy that connect us to all other life. Hildyard, a novelist and essayist, writes with lyrical precision about this doubled existence. She examines our relationships with animals, from pets to factory farms to the microbiome within our own guts. The book moves between scientific observation and personal reflection, always returning to the question of how to live knowing that our actions ripple outward in ways we cannot fully perceive. Hildyard avoids both despair and false comfort, instead cultivating a quality of attention that takes seriously both bodies we inhabit. The prose is compressed and rewarding, requiring slow reading. She writes about slaughterhouses and beehives, about children's understanding of death and adults' capacity for denial. This brief book offers a way of thinking about environmental crisis that is neither political manifesto nor self-help guide but something more like philosophy conducted through close observation of the living world.