How many members of a species does it need in order to become classified as endangered?

To better answer you question please click on the following link: http://www.endangeredspecie.com/Interesting_Facts.htm There is not a set number at which an animal is place on the list however it is based on the decline of the species population. The following in an outstanding website that provides more information such as types, locations, etc... of endangered animals. http://www.endangeredspecie.com/ Great Question!!!

One or more. The requirement for being classified as "endangered" is not based on numbers. Rather, it is a species or subspecies or population (usually) that "is in immanent danger of extinction". The numbers vary all over the place, from taxon to taxon. They are usually declining, though.