• In addition, unoccupied habitat was included as part of critical habitat for less than onethird of the species we considered.

• Wildlife Service and state wildlife agencies, has released captive-reared chicks into suitable unoccupied habitat.

• Mitchell’s satyr has survived because its primary habitat has not been irreversibly altered or destroyed in its totality; unoccupied wetlands and fens of high-quality exist within its historic range (Shuey 1997), although corridors for dispersal to unoccupied sites have been lost (Szymanski et al. 2004).