The owl is a bellman because, according to superstition, an owl hooting foretells death. So,when the owls screamed and the crickets cried, it symbolized evil and ominous doings.
In Act 2, scene 4, Ross and an old man are talking about the night before and how many unnatural things happened.
The scenes that are most notable take place at night or in some kind of dark spot.
Such as the vision of the dagger, the murder of Duncan, the murder of Banquo, and Lady Macbeth’s sleep-walking, when Banquo rides home to meet his killers, the owl screaming and the Falcon being killed by the owl, which all happen at night, when it is dark. First, it stands for the death and evil in the play.
“The raven himself is hoarse that croaks the fatal entrance of Duncan under my battlements.” In Act I, scene 5, Macbeth has already thought about the assassination. The animals are all going crazy and doing things that are not natural, just like Macbeth is doing. The last type of imagery is blood, it is very important in ‘Macbeth’.
It symbolizes honor and bravery and also deceit and evil.
Clothing, darkness and blood are four major sources of Imagery.
Clothing is meant to show what a person has earned,darkenss is meant to symbolize evil, animals show what is natural and blood stands for death.
The darkness is supposed to show how all of the horrible things that occur in the night could be blocked out.
They thought that if they did it at night, no one would see or pay that much attention, so they would not feel as much guilt about the murders.