As millions of birds migrate south for the winter, many face dangerous obstacles on their journey, and experts say people can help them have a safe trip.

This week, scientists estimated that 1.25 billion birds were in flight, mostly in the Southeast, where a northerly breeze behind a cold front helped birds move south for the…

As millions of birds migrate south for the winter, many face dangerous obstacles on their journey, and experts say people can help them have a safe trip.