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4 activities of its own or by facilitating private development. Section 7 of the ESA requires all federal agencies to consult with the Secretary to “[e]nsure that any action authorized, funded, or carried out by such agency” is not likely to adversely affect a listed species’ critical habitat. 16 U. S. C. §1536(a)(2). If the Secretary determines that an agency action, such as issuing a permit, would harm critical habitat, then the agency must terminate the action, implement an alternative proposed by the Secretary, or seek an exemption from the Cabinet-level Endangered Species Committee. See National Assn. of Home Builders v. Defenders of Wildlife, 551 U. S. 644, 652 (2007); 50 CFR 402.15 (2017).

Due to resource constraints, the Service did not designate the frog’s critical habitat in 2001, when it listed the frog as endangered. Designation, at 35118–35119. In the following years, the Service discovered two additional naturally occurring populations and established another population through translocation. The first population nonetheless remains the only stable one and by far the largest. Dept. of Interior, U. S. Fish and Wildlife Serv., Dusky Gopher Frog (Rana sevosa) Recovery Plan iv, 6–7 (2015).

In 2010, in response to litigation by the Center for Biological Diversity, the Service published a proposed critical-habitat designation. Designation, at 35119. The Service proposed to designate as occupied critical habitat all four areas with existing dusky gopher frog populations. The Service found that each of those areas possessed the three features that the Service considered “essential to the conservation” of the frog and that required special protection: ephemeral ponds; upland open-canopy forest containing the holes and burrows in which the frog could live; and open-canopy forest connecting the two. But the Service also determined that designating only those four sites would not adequately ensure the frog’s conservation.