Endangered species are those whose prospects for survival in New Jersey are in immediate danger because of a loss or change in habitat, over-exploitation, predation, competition, disease, disturbance or contamination. Assistance is needed to prevent future extinction in New Jersey.
Threatened species are those who may become endangered if conditions surrounding them begin to or continue to deteriorate.
There are other classifications for wildlife as well, including Stable, Species of Special Concern Special Concern and Undetermined.
See the official list for NJ, along with information sheets about identification, habitat and status and conservation information at http://www.state.nj.us/dep/fgw/tandespp.htm