U.S. Code of Federal Regulations

Regulations most recently checked for updates: Aug 27, 2025

All TitlesTitle 50Chapter IVPart 424Subpart B - Subpart B—Revision of the Lists
§ 424.10 - General.
§ 424.11 - Factors for listing, delisting, or reclassifying species.
§ 424.12 - Criteria for designating critical habitat.
§ 424.13 - Sources of information and relevant data.
§ 424.14 - Petitions.
§ 424.15 - Notices of review.
§ 424.16 - Proposed rules.
§ 424.17 - Time limits and required actions.
§ 424.18 - Final rules—general.
§ 424.19 - Impact analysis and exclusions from critical habitat.
§ 424.20 - Emergency rules.
§ 424.21 - Periodic review.
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