Feds Narrow the Definition of "Take" Under the Endangered Species Act

The U.S. Fish and Wildlife Service and NOAA's National Marine Fisheries Service have finalized a rule rescinding the longstanding regulatory definition of "harm" under the Endangered Species Act — a change that takes effect September 14, 2026. Read the full rule here.

The short version: since 1975, "harm" (one of the acts that counts as prohibited "take" of a listed species) has included habitat modification or degradation that actually kills or injures wildlife by disrupting breeding, feeding, or sheltering. That regulatory gloss is now gone, and the Services are not replacing it with anything. Going forward, "take" reverts to the bare statutory language — acts like hunting, shooting, trapping, or capturing — interpreted, per the Services, as requiring an affirmative act directed intentionally at a particular animal, not indirect habitat-based effects on a population.

Why now: The Services lean almost entirely on Loper Bright (2024), which ended Chevron deference and requires agencies to adopt the single best reading of a statute rather than merely a "permissible" one. They argue the 1995 Supreme Court decision upholding the old definition, Babbitt v. Sweet Home, only found it reasonable under Chevron — not the best reading — and adopt Justice Scalia's dissent in that case as the better interpretation.

Does This Mean Habitat Protection Is Gone? No — But It's Narrower

This is the part of the rule that's easiest to overstate in either direction, so it's worth separating out clearly. The ESA protects habitat through several distinct provisions, and this rule touches exactly one of them.

What's unchanged:

• Section 7 — Federal agencies still must ensure their own actions aren't likely to jeopardize a listed species or destroy/adversely modify critical habitat. This is the backbone of habitat review for anything requiring a federal permit, and it's untouched.
• Section 4 — Critical habitat designations continue exactly as before. No species classifications or habitat boundaries change.
• Section 5 — The government's authority to purchase land for conservation is unaffected.
• Section 6 — Cooperative agreements with states for species and habitat conservation continue.
• State law — States remain free to impose habitat protections stricter than the federal floor.

What changed:

• Section 9 — the provision prohibiting private citizens from "taking" a listed species. Since 1975, the regulatory definition of "harm" swept habitat modification into that prohibition, meaning a private party could face take liability for degrading habitat alone, with no animal directly killed or injured. That's the piece being rescinded. Section 9 liability now requires an affirmative act intentionally directed at a specific animal.

Put simply: habitat protection remains a federal agency obligation (via section 7) and a designation obligation (via section 4), and habitat conservation remains available through voluntary programs, land acquisition, and state law. What's eliminated is habitat modification as a standalone basis for private-party liability under section 9. The Services' position is that Congress always intended habitat protection to run through sections 5 and 7, not through the take prohibition aimed at private citizens — and that the 1975 regulation improperly merged the two.

What this changes in practice: Applicants for section 10(a) incidental take permits will no longer need to address habitat impacts — only direct, intentional take — to obtain a permit. The Services estimate this saves regulated parties $361–521 million a year, mostly in reduced HCP planning and mitigation costs.

The pushback: Of roughly 358,000 comments received, many argued this guts the ESA's practical tool against habitat loss — the leading driver of species decline — regardless of which section is doing the work, and threatens a multi-billion-dollar mitigation and restoration industry built around the old rule. The Services largely dismissed these as reliance on what they now consider an unlawful regulation, entitled to little weight.

Why This Matters for Idaho Outfitters and Guides

Most outfitters operate under a Forest Service or BLM special use permit, and many of those permits sit downstream of an ESA section 7 consultation — for grizzly bear, bull trout, lynx, wolverine, or salmon and steelhead, depending on where you operate. That piece is unchanged. The agency issuing your permit still has to insure its action isn't likely to jeopardize a listed species or adversely modify critical habitat, and existing incidental take statements tied to your SUP aren't reopened by this rule.

Where this rule is more directly relevant is section 9 liability exposure — the individual outfitter or guide's own risk of being accused of an unpermitted "take." Under the old habitat-based definition of "harm," activities that incidentally affected a listed species' habitat — trail maintenance and reroutes, campsite hardening, livestock or stock use near riparian habitat, vegetation or chainsaw work near sensitive drainages — could in theory expose an operator to take liability even with no animal directly injured or killed, if the activity was found to significantly impair breeding, feeding, or sheltering. Under the narrowed definition, section 9 take liability now attaches only to affirmative acts intentionally directed at a specific animal — not to incidental habitat effects from routine outfitting operations, trail work, or camp management.

A few practical takeaways:

• Lower incidental-take exposure for routine field operations — trail crews, camp maintenance, and similar habitat-adjacent work are less likely to be framed as a section 9 violation on their own.
• No change to your permit terms or your forest's consultation obligations. If your SUP has habitat-related conditions from a section 7 biological opinion, those still apply until the agency updates them.
• This is likely to be litigated. Conservation groups have already signaled they view this as unlawful, and courts could stay or vacate the rule before or after the September 14 effective date. Treat this as the current federal floor, not a permanent settlement — and remember Idaho and federal land managers can still layer on their own habitat conditions regardless of what section 9 requires.

For IOGA members whose work touches wilderness trail authorizations, MRA-based chainsaw use, or grazing/camp permits near listed-species habitat, this is worth watching closely as the litigation and any Forest Service guidance updates play out over the next several months.