A crow on a roof is hardly an event, yet Dave Bonta's five lowercase lines make it a small drama of watcher and watched. The situation is plain. Over the course of a morning, a crow works its way across a house and peers in at the people living there. The title gives the scene its charge. "Surveillance" belongs to security cameras and case files, and set beside a bird it makes an ordinary morning faintly ominous. The central idea is a reversal. We like to think of ourselves as the ones who observe nature, but here nature observes us, and what it sees is a household reduced to its habits.
The opening simile is the oddest thing in the poem. The crow is "inching over the house like a staircase," and the image works in two ways. A bird hopping up the pitch of a roof, one step at a time, really does look like something climbing stairs. A staircase is also a feature of a house's inside, so the simile pulls the interior onto the roof just before the poem turns to what the crow can see within. The grammar adds to the effect. The poem begins with a participle ("inching") and only then gives its subject, so for a moment the slow movement floats free, as if the house itself were creeping.
Then comes "looking in on us." The phrase is quietly double. To "look in on" someone is usually a kindly thing, the way a neighbour checks on an invalid, but the title has already warned us that this visit isn't friendly. The poem never settles between care and menace, and the unease comes from that. The list that follows loses its footing in the same way: "us / and our paper / our melancholy milk." The "and" appears once and then drops out, so the third item slides in without a joint. The people end up as one entry among objects, no more important than the newspaper (or perhaps the writer's own sheet of paper, since the word allows both) or the milk.
That last phrase is the best in the poem. "Melancholy" properly describes people, not dairy, so the mood is transferred from the household onto its breakfast. The two m's and the l's in "melancholy milk" also make the words sound soft and a little sour. Against the crow's black, the milk is pale and the newsprint grey, and the whole scene seems drained of colour. Whether the sadness belongs to the people or only appears when a crow's eye is turned on them is left open, which suits a poem about being seen from outside.
The form is as spare as the mood. There is no rhyme, no capital letter and no full stop, so the sentence simply stops after "milk," as though the observing hasn't finished. The lines shrink from nine syllables to six, then five, then four, narrowing as the crow's attention focuses, before the last line stretches slightly around its long word "melancholy." The participles "inching," "looking" and "morning" share an unhurried -ing sound that gives the poem a slow, patient tread. The verb "spent" also suits the crow's leisure, since it has a whole morning to spend where the people in the house presumably do not.
The poem's quiet cleverness is that the surveillance is mutual. To know the crow "spent the morning" at its watching, the speaker must have been watching too, keeping an eye on the bird that kept an eye on them. Each side has made the other a subject of study. That is the poem's real significance: in five short lines it turns a familiar nature sketch into a small, unsettling lesson in perspective, and it suggests that being looked at, even by a crow, can show us how ordinary and how sad our own routines have become.