The speaker looks at photographs a friend has shared, taken at Coney Island. The first shows an empty beach with a derelict amusement park behind it, and one lonely bird. The second shows the bird in flight, wings spread, so neat and striking that it looks like a postcard. Yet the speaker calls it "a postcard of a living creature," as if something alive has been turned into an image.
The emotional centre comes in the last stanza. The friend took the photo "knowing I'd see it," and trusted that the speaker would understand what the bird means. The poem never spells that meaning out. The grey sky, the abandoned park and the solitary bird all point toward loneliness, and the final line names it: "all the bloody melancholy we do share." The mood is quiet and wistful, but not wholly bleak. The sadness is real, yet it connects the two friends, and being understood without explanation feels like a small comfort.