|Common Raven image via Wikipedia|
The largest passerine is the Common Raven which can weigh as much as 3 pounds. They can be found across the northern hemisphere. When you hear the variety of noises, such as caws, croaks, and gurgles that the raven produces may not think of it as a songbird, but their wide range of vocalizations for communication is impressive.
|Verdin image via Wikipedia|
Hummingbirds are the smallest birds in the world but they are nonpasserines. According to the Birds of Michigan Field Guide by Ted Black nonpasserines are birds that in general have calls instead of songs and can be very large like waterfowl, raptors, gulls, shorebirds and woodpeckers. Some of the smaller nonpasserines are doves, swifts and hummingbirds.
image via farm1.static.flickr.com
At 3 inches long and weighing 0.1 oz, the Calliope Hummingbird Stellula calliope is North America's smallest bird. It nests in mountain areas of the northwestern United States and winters in Mexico.
And the Bee Hummingbird Mellisuga helenae which lives in Cuba and Isla de la Juventud is the smallest living bird in the world at length of 2 inches and a weight of 0.063 oz