A novel genetic model suggests that the ancestors of modern humans came from two distinct populations that split and reconnected during our evolutionary history.

US births declined in 2023 to the lowest level in more than 40 years, continuing a decades-long trend toward smaller American families. Total births for the year fell to 3.596 million, a 2 percent ...

All U.S. population growth in 2022-23 happened because of immigration, rather than births, for the first time since 1850, a ...

Immigration was the sole driver of the United States' population growth in a single year for the first time since records ...

According to census demographer Kristie Wilder, the population rise in cities is increasingly being “influenced by ...

U.S. bird populations are experiencing alarming declines due to factors such as habitat loss and climate change, according to ...

Cities like Boston and Chicago celebrate the day with parades, river dyeing, and cultural events, attracting millions of ...

Populations rose in many US cities last year. The two fastest-growing metros were in Florida.

The Trump administration official overseeing the dismantling of the main U.S. foreign aid agency proposed phasing out help ...

Over the past 20 years the U.S. butterfly population has declined 22%, a dramatic loss that has scientists concerned. "The easy number to think about is the total number of butterflies in your yard.

Census data reveals that Jasper County is third among the fastest-growing counties in the United States. Local officials say ...