An Endangered Species is one reduced to such low numbers of individuals that the population is at risk of becoming extinct.
Extinction and endangerment have a scientific and a legal (or regulatory) basis. An example of an extinct species is the Passenger Pigeon (Ectopistes migratorius).
Finding the scientific name requires detective work, because there can be multiple common names that can vary geographically, and similar common names can refer to a variety of organisms.
When conducting surveys on private property, USGS researchers comply with State and Tribal laws, including trespassing and privacy laws. USGS researchers are required to obtain written permission from the landowner when conducting new surveys, not to t
USGS's Status and Trends of Biological Resources Program supports and provides the collection and analysis of biological data for use by natural resource managers, scientists, and the gene