A working guide to wildlife and endangered species law for the lawyer advising a landowner, a project, or an advocate. Part one covers the statutory architecture and the decision that established the prohibition means what it says. Part two covers listing, critical habitat, and the economics that are excluded from one and permitted in the other. Part three covers take, the harm regulation, and the causal limit that decides enforcement disputes. Part four covers section 7 consultation, its sequence, and its two structural limits. Part five covers incidental take permits, habitat conservation plans, and voluntary conservation assurances. Part six covers the older strict-liability statutes. Part seven covers enforcement, citizen suits, and standing. Part eight covers practice by posture.