Meaning Please Help Please?

Hide in the hollow trunk

of the willow tree,

its listening familiar,

until, as usual, they

cuckoo your name

across the fields.

You can hear them

draw the poles of stiles

as they approach

calling you out:

small mouth and ear

in a woody cleft,

lobe and larynx

of the mossy places.

Can someone help me identify the meaning of the poem..

please! i really do not understand it?