The first stanza of the poem is saying that the bird is not aware of the fact that the speaker is present so he behaves normally. He bit into a worm and ate it raw. Why would the speaker mention about the fact that the bird ate the worm raw? In other words does she expect the bird to cook the worm or something of that sort before eating it? The first line, “a bird came down the walk,” sounds like someone walking on a sidewalk.