How does the author use foreshadowing in Other Voices, Other Rooms?

Birds play a symbolic role in this novel, beginning with Joel's being awakened on his first morning at Skully's Landing when Miss Amy traps a blue jay in Joel's bedroom. The bird's entrapment foreshadows Joel's ultimate need to escape the suffocating environment of the Landing as well as the flawed people who inhabit it. There is also foreshadowing when Zoo tells Joel that Randolph likes dead birds with pretty feathers. In this instance, the dead birds symbolize Joel's ultimate capture by Randolph, who enjoys the company of pretty boys. Throughout the novel, Joel takes special note of birds, which seem to act out on the feelings Joel is experiencing at the time.