Background Difference-in-differences is a method commonly used in population health research. It is based on assumptions that ...

Airborne laser scanning across the Maya lowlands has produced a Late Classic population estimate of roughly 9.5 to 16 million ...

Breaking away from fragmented estimates, regional experiments between 1850 and 1872 laid the groundwork for today's massive census operations.

Scientists and advocates worry the state’s predator control gamble will fail but still expand aerial bear gunning across ...

Hyogo prefecture has set a population target of around 800 bears, a level at which it considers they are not at risk of ...

Scientists studying Puerto Rico's shark fishery made an unexpected discovery: juvenile scalloped hammerheads being caught ...

Helicopter culls, political pressure and clashing worldviews will collide again as one of the nation’s fiercest environmental ...

A study in Costa Rica has big implications for extinction and conservation.

How election polls are conducted in Maine and what they can tell us about voters’ priorities.

The Supreme Court blocked Trump’s plan to limit birthright citizenship. Here’s what the ruling means in Mississippi.