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Home is Where the Habitat is: Supreme Court

Addresses Critical Habitat under the

Endangered Species Act



December 19, 2018

On November  27, 2018, in a unanimous decision, the Supreme Court held that only habitat of an
endangered species can be designated as critical habitat under the Endangered Species Act (ESA).
(Justice Kavanaugh did not participate in the decision.) The case, Weyerhauser Co. v. US. Fish and
Wildlife Service, involved the Fish and Wildlife Service's (FWS's or Service's) decisions (1) to designate
a 1,544-acre private property as critical habitat for the endangered dusky gopher frog, and (2) not to
exclude the property from its critical habitat designation. The Court remanded the case to the U.S. Court
of Appeals for the Fifth Circuit (Fifth Circuit) to determine whether the private property was habitat for
the frog and if the FWS abused its discretion when it decided not to exclude the property from the critical
habitat designation.
Although the Supreme Court did not define habitat under the ESA, its ruling is significant because it
clarifies that, in order to be deemed critical habitat, an area must first meet the requirements to be
deemed habitat for the endangered species. Further, the Court's decision opens the door to judicial
review of the FWS's discretion not to exclude property from its critical habitat designations. This
Sidebar explains the criteria for designating critical habitat under the ESA, reviews the critical habitat
designation for the dusky gopher frog, and discusses the Weyerhauser Co. decision and the importance of
the case moving forward.

Designating   Critical Habitat under   the ESA
Congress enacted the ESA to conserve endangered species and their habitats. For each species listed as
threatened or endangered under the ESA, the Secretary of the Interior (through the FWS) must designate
any habitat of such species which is then considered to be critical habitat. The ESA authorizes the FWS
to designate two types of critical habitat: (1) specific areas within the geographical area occupied by the
species, which contain the physical or biological features essential to the conservation of the species
and may require special management protections (occupied habitat); and (2) areas outside the
geographical areas occupied by the species if the Secretary determines that such unoccupied areas are
essential for the conservation of the species (unoccupied habitat).

                                                                Congressional Research Service
                                                                  https://crsreports.congress.gov
                                                                                     LSB10234

CRS Legal Sidebar
Prepared for Members and
Committees of Congress

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