Page:Weyerhaeuser Company v. United States Fish and Wildlife Service, et al..pdf/4

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delivered the opinion of the Court.

The Endangered Species Act directs the Secretary of the Interior, upon listing a species as endangered, to also designate the “critical habitat” of the species. A group of landowners whose property was designated as critical habitat for an endangered frog challenged the designation. The landowners urge that their land cannot be critical habitat because it is not habitat, which they contend refers only to areas where the frog could currently survive. The court below ruled that the Act imposed no such limitation on the scope of critical habitat.

The Act also authorizes the Secretary to exclude an area that would otherwise be included as critical habitat, if the benefits of exclusion outweigh the benefits of designation. The landowners challenged the decision of the Secretary not to exclude their property, but the court below held that the Secretary’s action was not subject to judicial review.

We granted certiorari to review both rulings.