Conn. Gen. Stat. § 26-307: Review.

The commissioner shall review, at least every five years, the designation of species as endangered, threatened or of special concern, and areas identified as essential habitats to determine whether he should: (1) Add or remove any species from the list of endangered or threatened species or species of special concern; (2) change the designation from one category to another; (3) add or remove any area from the list of essential habitats for endangered or threatened species. The review of species that are listed as endangered by the United State Department of Interior shall be conducted, to the extent practicable, in conjunction with the periodic year review process of the Department of Interior pursuant to the Endangered Species Act.