Cougars are ambushing and killing wolves—and no one knows why
These rare kills in Washington State have biologists searching for answers. “Everyone always assumes wolves have the upper hand,” says one scientist. “But that’s not always the case.”
Should a haven for grizzlies be off limits to hikers?
Goldfish aren't the ho-hum fish you thought they were
Meet Africa's grumpy grazer, the buffalo
Blue-throated macaw
