No species meet the exact “Endangered Species in Connecticut” criteria for this list
This post uses Connecticut’s official legal definition of “Endangered” from the CT DEEP as the sole filter. That strict filter excludes species that are only federally listed, labeled “Threatened” or “Special Concern” at the state level, known only from historical records, or extirpated from the state. Apply that exact rule and no species remain on the list.
State and federal listings differ and change over time. CT DEEP, USFWS, and NatureServe use different categories and update them on different schedules. Taxonomy, range shifts, and recovery actions also move species between categories. Near matches include federally protected animals that occur in Connecticut (for example, the bog turtle), many coastal birds protected under federal programs (for example, the piping plover), and several plants, freshwater mussels, and invertebrates that are state-listed as “Threatened” or “Special Concern.”
Explore related, useful categories instead. Check CT DEEP’s Threatened and Special Concern lists, the USFWS list of species with ranges overlapping Connecticut, county-level or regional rare-species reports, and NatureServe Explorer. These sources show the species most at risk in Connecticut and offer conservation actions to help.
