Reshaping how the Endangered Species Act is implemented is seen as a way to streamline bureaucracy, but critics of the plan say it will leave species at greater risk of extinction.

From the difficulty of tracking rare populations to the danger of poachers exploiting distribution data, the complications of studying endangered species require creative solutions from researchers.

Researchers recommend greater conservation efforts toward non-mammals and small creatures.

Researchers collate a list of the 100 most rare and unique avian species facing extinction.

A new report finds that about a quarter of the world’s cartilaginous fish species are at risk of extinction.