; and (ii) a fire or other natural catastrophic event in an area prone to such an event. . (2) By inserting after paragraph (3) the following: (_) Covered plan or agreement The term covered plan or agreement means a conservation plan required under section 10(a)(2)(A) or a candidate conservation agreement with assurances under section 10(k), respectively. . (3) By inserting after paragraph (5) the following: (_) Conserved habitat areas The term conserved habitat areas means areas explicitly designated for habitat restoration, acquisition, protection, or other conservation purposes under a covered plan or agreement. . (4) By inserting after paragraph (13) the following: (_) Operating conservation program The term operating conservation program means those conservation management activities that are expressly described in a covered plan or agreement and that are to be undertaken for the affected species when implementing the plan or agreement, respectively, including measures to respond to changed circumstances. . (5) By inserting after paragraph (24) the following: (_) Unforeseen circumstances The term unforeseen circumstances means changes in circumstances affecting a species or geographic area covered by a covered plan or agreement that could not reasonably have been anticipated by plan developers and the Secretary at the time of the development of such plan or agreement, respectively, and that result in a substantial and adverse change in the status of the covered species. . (6) By redesignating the paragraphs of such section as paragraphs (1) through (25), respectively. (b) Conforming amendment Section 7(n) of such Act ( 16 U.S.C. 1536(n) ) is amended by striking section 3(13) and inserting section 3(16) . (c) Assurances governing permit, plan, candidate conservation agreement with assurances, and safe harbor agreement issuance, modification, and revocation Section 10 of such Act ( 16 U.S.C. 1539 ) is amended as follows: (1) Subsection (a)(2)(B) is amended in the matter following clause (v) by adding at the