More than half of all species of birds are passerines, or perching birds, so named because their feet are adapted to perching on tree branches. Most birds found in the woods (and the back yard) are passerines, as are most songbirds. Clearly, the small selection included here is but a paltry sampling.
Be like the bird, who halting in his flight
On limb too slight,
Feels it give way beneath him, yet sings
Knowing he has wings.
Victor Hugo, (1802-1885)
Information from Wikipedia: Passerine.