The massive annual spring migration of America's birds – millions of them – is underway. Here's how to follow along at home.

Peak bird migration is about to start in Colorado and around the country. Here are tools for tracking and identifying the ...

The annual spring migration has begun, filling the skies with millions of birds that primarily move at night as they make their way ... and birds such as Clark's nutcracker, the mountain chickadee ...

Colorado and other Rocky Mountain states have altitudinal migrants, such as the Clark's nutcracker ... with larger birds tending to make longer trips. Exactly how birds know where and when ...

The massive annual spring migration of America's birds – millions of them – is underway. Here's how to follow along at home.

Utah and other Rocky Mountain states have altitudinal migrants, such as the Clark's nutcracker ... with larger birds tending to make longer trips. Exactly how birds know where and when to migrate ...

There are five types to look for, with larger birds tending to make longer trips ... Think of the Rocky Mountains and birds such as Clark's nutcracker, the mountain chickadee and rosy finches.

Clark’s nutcracker ... Weather patterns will facilitate day-to-day movements. It’s easier for birds to fly with the wind than ...