Chapter 35. Endangered Species 16 U.S. Code §1531. Congressional findings and declaration of purposes and policy 16 U.S. Code §1532. Definitions 16 U.S. Code §1533. Determination of endangered species and threatened species 16 U.S. Code §1534. Land acquisition 16 U.S. Code §1535. Cooperation with States 16 U.S. Code §1536. Interagency cooperation 16 U.S. Code §1537. International cooperation 16 U.S. Code §1537a. Convention implementation 16 U.S. Code §1538. Prohibited acts 16 U.S. Code §1539. Exceptions 16 U.S. Code §1540. Penalties and enforcement 16 U.S. Code §1541. Endangered plants 16 U.S. Code §1542. Authorization of appropriations 16 U.S. Code §1543. Construction with Marine Mammal Protection Act of 1972 16 U.S. Code §1544. Annual cost analysis by Fish and Wildlife Service