Eight words, three lines, and a whole relationship sketched in. On a morning walk beside a canal, the speaker meets a swan, and the surprise of the poem is that the swan has opinions. Instead of a person gazing at a beautiful bird, we get a person being quietly disapproved of by one. The central idea is a small reversal: the watcher becomes the watched, and nature stops being scenery and becomes a character with a grievance.
The construction is very compressed. Line one, "morning swan," reads like a note jotted in a field diary: a time, a creature, nothing more. It has no verb and no feeling, and it could be a sighting logged by a birdwatcher. The second line shifts the register: "my old acquaintance." The possessive "my" claims the swan, and "old" tells us this is not a first meeting but a pattern, a regular walk with a regular encounter. Then the third line lands the joke and the emotion together: "vexed at me." The poem moves from the general ("swan") to the personal ("my") to the speaker as the object of the sentence ("me"). By the last word, the speaker has become the subject of someone else's mood.
The word choices matter a great deal. "Acquaintance" is a stiff, slightly formal word, the kind you'd use for someone you nod to at a bus stop but wouldn't call a friend. Applied to a swan, it is funny, and it also tells us something true about the relationship: familiar, repeated, but with distance in it. There is a faint echo, too, of the old phrase "auld acquaintance" from the New Year song, which gives the word a warm, traditional ring even as the swan refuses to be warm. "Vexed" is equally well judged. It is mildly old-fashioned and mild in force. The poem doesn't say the swan hisses, flares its wings or attacks, which is what swans are known for. It says "vexed," the vocabulary of an irritated neighbour. That understatement makes the scene gentle and comic rather than threatening.
The poem also leaves its grammar open. There is no main verb, so the lines hang together as fragments, as if the speaker is reporting the moment as it happens, in the half-sentences of passing thought. We never learn why the swan is vexed. Perhaps the speaker has no bread, or is walking too close, or is simply late. Because the poem does not say, we are invited to wonder whether the swan is really vexed at all, or whether the speaker is reading human feelings into a bird's stare. "Vexed at me" could be a perception, an admission, or a bit of self-mockery. The poem stays light enough to hold all three.
There is no rhyme here, and the sounds work more quietly. The first two lines share soft nasal consonants, in "morning," "swan" and "acquaintance," which make the opening smooth and unhurried, like a bird gliding. Then "vexed" arrives with its hard, clipped x and d, and the line snaps shut. The rhythm follows the same pattern. Counted by syllables, the lines run three, five, three, so the longer middle line is held between two short ones. The poem seems to inhale on "my old acquaintance" and then exhale a quick, dry punchline. It resembles a haiku in its compression and its attention to a single moment, though it keeps a spoken, conversational tone rather than a formal one.
The title, "Canal walk," is easy to skip past, but it supplies everything the poem leaves out: the setting, the habit of the walk, the reason this swan might be an "old" acquaintance at all. A canal is a made landscape, a human-shaped stretch of water where wild creatures nevertheless go on living their own lives. That fits the poem's quiet point. The speaker is a visitor in the swan's territory, not the swan in the speaker's.
What makes the poem worth reading is how much it does without effort. It treats a wild animal with humour and respect, as an individual with a history and a temper. It also lets the human speaker be a little foolish, the one who has apparently done something wrong. In a few words it suggests that attention goes both ways: if we spend enough mornings looking at the world, the world may start to look back, and not always approvingly.