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In persuading the two murders to murder Banquo, Macbeth repeatedly compares them to dogs. See Act 3, Scene 1, lines 91-107. Also, there are many uses of birds in metaphors.
The ghost of Banquo appears to Macbeth one time during the banquet scene in Shakespeare's play "Macbeth."
Banquo is his best friend. Aside from that, Banquo is well loved by many, and if he were to be killed by Macbeth, it would look bad on him. By having the murderers do it, he can mourn Banquo's death and be free of suspicion.
Three for Banquo, six men to Macduff's castle
Macbeth is telling Banquo's ghost not to shake his head at him. Banquo knows that Macbeth had him killed and is filling Macbeth's heart with shame but shaking his gory locks at him. His face is covered in blood and he has many gashes on his head, which is where the blood/gore would be coming from.
Macbeth decides to kill Banquo out of fear. he is afrait of Banquo out of two reasons, the first being that Banquo had defied him in act two by not agreeing to help him. the second reason is that Banquo is questioning how Macbeth got so many things go his way after the witches prophosy The third reason Macbeth is afraid is that the witches prophesise that Banquo's son will sit on the crown, if his son is sitting on the crown Macbeth will obviusly be dead
The play doesn't say so, but it is a plausible interpretation. Macbeth wants to be safe; it wouldn't be safe having these cutthroats who know he was involved in Banquo's death hanging around.
Macbeth only hired 2 murderers to attack Banquo and his son, but there ended up being 3 murderers.
The three witches described Banquo as 'Not so happy, yet much happier' than Macbeth. They meant that Banquo wasn't going to be as fortunate as Macbeth. Banquo wasn't going to advance any further than being Captain to King Duncan I [d. August 14, 1040]. But Banquo ultimately was going to be more contented. Banquo was going to leave behind a family, and by that family lineBanquo would become the ancestor to a long line of kings. In contrast, Macbeth [d. August 15, 1057] would have no family, and his reign would end with him.
Banquo: What are these, so withered and wild in their attire that they look not like the inhabitants o' the earth and yet are on't? . . . You seem to understand me, by each at onceher choppy finger laying upon her skinny lips; you should be women, yet your beards forbid me to interpret that you are so.
Well, if you mean killed, there were many! King Duncan, Banquo, Lady Macduff, Lady Macduff's son, other members of the Macduff family and Macbeth!
According to another note on the same subject here on Wikianswers, (Why does Macbeth see Banquo's ghost?) it was believed at the time the play was written that a murderer could see the ghost of his victim. However in Macbeth it's open to interpretation- is there really a ghost there, or is it a figment of his imagination brought on by a guilty conscience?