Millions of birds migrating south Thursday night

GRAND RAPIDS, Mich. — Spencer High is one of many that calls birding a favorite hobby.

"It's fun to know what you're looking at and what you're sharing a place," said High.

For people like High, the fall migration is one of the most fun times of year for bird watching.

"This evening, there are an estimated 471 million birds that will be flying over the United States working their way south from their breeding grounds that are more up in the northern part of North America, down south into their wintering grounds."

Live maps like the ones offered by BirdCast show current migration patterns using weather radar. Most of the movement you'll see happens at night.

"Most birds do migrate at night, and are migrating from sundown until sunup. And so you'll get a peak of surge of activity two h