which stretches 400 miles. Though famous for its caves, the park also has more than 70 threatened or endangered species that include birds, crustaceans, and fish. It is believed that the first human entered Mammoth Cave 4,000 years ago. ...
This is a classic and much studied problem encountered in species abundance surveys in ecological research, where a key question becomes estimating the size of the zero abundance class—the typically great number of species not observed in a sample because of their rarity [42]. To get an idea...