You are out for a hike and hear a bird song or call and you say to yourself, which bird is that?

Here are some well-known ones:

Common loon:

Common Loon (mp3)

Red-Tailed Hawk:

Red-tailed Hawk (mp3)

Ruffed Grouse:

Ruffed Grouse (mp3)

Northern Flicker:

42-Northern Flicker (mp3)