The latest population estimate for North Atlantic right whales is out. Scientists say they’re hopeful a decade-long decline could finally be coming to an end. But to make that kind of ...

"How to estimate population size is really the backbone of wildlife research," Rittenhouse says. "The number one question any wildlife biologist is asked is how many animals are there?" ...

In this Q&A, we speak with Senior Demographer Jeffrey S. Passel about how the Center estimates the number of unauthorized immigrants in the U.S.

Environmental DNA concentrations vary greatly across productive and degradative conditions, with implications for the precision of population estimates.

New genomic analysis has allowed scientists to estimate the population size of the first Samoans to arrive on the Pacific island some 3,000 years ago.

An international team of scientists has succeeded in using the signature whistles of individual bottlenose dolphins off the coast of Namibia to estimate the size of the population and track their ...