The big picture: It's not just Arizona. Researchers tracked species nationwide and found declines almost everywhere — even among birds once thought resilient, like waterfowl. Roughly one-third of U.S.

Two Arizona national parks were named among the best parks for seeing wildlife like mountain lions, bison and birds. Here's ...

The species has since recovered in most places. Desert-nesting bald eagles in Arizona still struggle with reduced habitat. Conservation groups tried unsuccessfully to prevent the birds from being ...