Unforeseen circumstances
Unforeseen circumstances means changes in circumstances affecting a species or geographic area covered by a conservation plan or agreement that could not reasonably have been anticipated by plan or agreement developers and the Service at the time of the conservation plan's or agreement's negotiation and development, and that result in a substantial and adverse change in the status of the covered species.
Source
50 CFR § 17.3
Scoping language
In addition to the definitions contained in part 10 of this subchapter, and unless the context otherwise requires, in this part 17: