50 CFR 424.21 : Wildlife And Fisheries (§ 1.1 To Parts 698-699) — (Subchapter A To Parts 561-599) — Joint Regulations (United States Fish And Wildlife Service, Department Of The Interior And National Marine Fisheries Service, National Oceanic And Atmospheric Administration, Department Of Commerce); Endangered Species Committee Regulations (Part 400 To Parts 454-499) — (Part 400 To § 424.21) — Listing Endangered And Threatened Species And Designating Critical Habitat (§ 424.01 To § 424.21) — Revision Of The Lists (§ 424.10 To § 424.21) — Periodic review.

4 Aug 2016

At least once every 5 years, the Secretary shall conduct a review of each listed species to determine whether it should be delisted or reclassified. Each such determination shall be made in accordance with §§ 424.11, 424.16, and 424.17 of this part, as appropriate. A notice announcing those species under active review will be published in the Federal Register. Notwithstanding this section's provisions, the Secretary may review the status of any species at any time based upon a petition (see § 424.14) or upon other data available to the Service.

50 CFR 424.21