Help me find the meaning of this poem?

Hi there.
I’m doing a research project and i happened to stumble on this poem.
I would like to know if anyone would have ideas for possible meanings of the poem?
This one�s just a plain crow, pal,
Flapping its wings as if to fly
While grasping tight with claws the fence,
Trying for nothing, or just to try.
It isn�t lark or dove or linnet,
It isn�t mild or sycophantic.
It rolls its shrouded, shrieking caw
Along the wire, remotely frantic.
So here I am, peeling meaning,
Tossing it back like so much trash.
The crow protests, a frayed black mess
Of hollow bones and air and flesh,
No rarae aves. Common ones,
A dime a dozen, thieves of glitter,
Black lace fan of fancy panic,
Midwestern plague, sycamore clutter.
Who�ll sing a psalm for days long gone?
The nightingale? The darkling thrush?
Who�ll catch the blood and sew the shroud,
Tally the holdings of hand and bush?
And who has time to wrestle down
A God beyond, or one who�s here,
Sucking on brandy and cigars,
Scoffing at an erstwhile fear,
The cruciate bloom of a man�s first lie,
Of staying afloat or drawing breath?
Not I said the fly with his little eye
Just before he�s smacked to death.
A rook takes off, flaps across the sky,
A severed wing in its bright black beak.
And who am I to write that down?
I�d rather let the sparrow speak.

thanks for the help!
Answer #1
I know this is brief but sounds like a story of a guy watching birds particularly a crow eating flies on his garden fence.
Quaint!