A Thrush Sings Within A Dark Forest

A thrush sings within a dark forest.  What does it mean?  Is it an allegory?  The beginning of a fairy tale?  Or is it simply a thrush singing within a dark forest?

                Come In

As I came to the edge of the woods,
Thrush music -- hark!
Now if it was dusk outside,
Inside it was dark.

Too dark in the woods for a bird
By sleight of wing
To better its perch for the night,
Though it still could sing.

The last of the light of the sun
That had died in the west
Still lived for one song more
In a thrush's breast.

Far in the pillared dark
Thrush music went --
Almost like a call to come in
To the dark and lament.

But no, I was out for stars:
I would not come in.
I meant not even if asked,
And I hadn't been.

Robert Frost, A Witness Tree (1942).

                    William Fraser Garden, "A Wood in Winter" (1885)

                    The Green Roads

The green roads that end in the forest
Are strewn with white goose feathers this June,

Like marks left behind by someone gone to the forest
To show his track.  But he has never come back.

Down each green road a cottage looks at the forest.
Round one the nettle towers; two are bathed in flowers.

An old man along the green road to the forest
Strays from one, from another a child alone.

In the thicket bordering the forest,
All day long a thrush twiddles his song.

It is old, but the trees are young in the forest,
All but one like a castle keep, in the middle deep.

That oak saw the ages pass in the forest:
They were a host, but their memories are lost,

For the tree is dead:  all things forget the forest
Excepting perhaps me, when now I see

The old man, the child, the goose feathers at the edge of the forest,
And hear all day long the thrush repeat his song.

Edward Thomas wrote "The Green Roads" in June of 1916.

            William Fraser Garden, "Rabbits on a Country Path" (1883)