There is much value in asking ourselves whether a line "fits" the poem, and not our preconceived notions of what the poem 'should' be. What it, the poem, the entity, speaks to us, and not what we want to say. It is like not knowing what meaning is contained in dream imagery until it finds its way into a piece of music. Step back from the text. Stop trying to hit me and hit me.
The bird, a blade of dry grass in her beak, lands lightly on the branch. All trees are good at listening; since they do not speak, they generally do not interrupt, which says nothing about comprehension.