The Fish and Wildlife Service and the National Marine Fisheries Service (Services) revised the definition of "destruction or adverse modification" contained within title 50 of the Code of Federal Regulations, section 402.02, to replace the invalidated definition of "destruction or adverse modification" of critical habitat with one that is consistent with the Endangered Species Act (ESA), its legislative history, and circuit court opinions. The revised definition provides the Services and other Federal agencies with greater clarity in how to ensure that any action they authorize, fund, or carry out is not likely to result in the destruction or adverse modification of critical habitat, consistent with section 7(a)(2) of the ESA.