This is all very simple. The whole song follows this same pattern: Am, C, F, G. It's on the 3rd fret, and these chords are relative to the capo. It's 3/4 timing, like a waltz, so strum appropriately. Each chord gets exactly 4 and this does not change. Flightless Bird, American Mouth by Iron & Wine Verse 1:

I was a q^Cuick wet boy Diving too d^Ameep for coins

All of your ^Fstraight blind eyes Wide on my^G plastic toys

And when the ^Ccops closed the fair I cut my l^Among baby hair

Stole me a ^Fdog-eared map And called for you^G everywhere

Chorus:

Have I f^Cound you? Flightless ^Ambird, j^Fealous, w^Geeping

^COr lost you? ^AmAmerican mouth

^FBig bill l^Gooming

Verse 2:

Now I’m a^C fat house cat Cursing my s^Amore blunt tongue

Watching the ^Fwarm poison rats Curl through the w^Gide/white fence cracks

Kissing on ^Cmagazine photos Those ^Amfishing lures thrown in the ^Fcold and clean

Blood of Christ^G mountain stream

Chorus:

^CHave I found you? ^AmFlightless bird, ^Fbrown hair ^Gbleeding

^COr lost you? ^AmAmerican mouth

^FBig bill, ^Gstill going down --Evan A.

Iron & Wine - Flightless bird american mouth