For decades, yellow fever has mainly been seen in jungle settings in sub-Saharan Africa and South America. The WHO estimates between 84,000 and 170,000 cases occur each year.

In the interim, Yellow Line commuters, who accounted for about 2,900 trips each weekday, have been forced to use much slower shuttle buses between Skokie and the Red Line terminal at Howard Street ...

Researchers studying yellow warbler responses to the parasitic cowbird realized that red-winged blackbirds were eavesdropping on the calls and reacting to them, too.