Scientists measured distances covered to compile a Top 5 list of ultramarathon runners of land mammals.
Tag: Animal Migration
Birds Are Vanishing From North America
The number of birds in the United States and Canada has declined by 3 billion, or 29 percent, over the past half-century, scientists find.
In the Blink of an Eye, a Hunt for Oil Threatens Pristine Alaska
For decades, opposition to drilling has left the Arctic National Wildlife Refuge off limits. Now the Trump administration is hurriedly clearing the way for oil exploration.