Attar's best known poem opens with an assembly. The birds of the world gather, discover that they have no king, and are told by the hoopoe, who knows the way because Solomon sent her, that they do have one: the Simurgh, who lives beyond seven valleys on a mountain at the edge of the world. The birds are enthusiastic until they learn what the journey costs, and then each produces an excuse. The nightingale cannot leave the rose. The parrot wants only immortality. The peacock remembers paradise and wants it back rather than its owner.
The hoopoe answers each in turn with a story, and this is the poem's actual method: a frame carrying dozens of short tales, some pious, some comic, some brutal. Those who set out cross the valleys of quest, love, knowledge, detachment, unity, bewilderment and finally poverty and annihilation, and almost all of them die on the way, of thirst, of fear, of exhaustion.
Thirty birds arrive. What they find, when they are finally admitted, is a mirror, and in Persian the pun does the theology: si murgh means thirty birds, and the Simurgh they have crossed the world to reach turns out to be themselves, seen truly. It is a resolution that manages to state the doctrine of annihilation and subsistence without a line of technical vocabulary, and it is why the poem has been translated more often than anything else Attar wrote.