"Hark! I laid their daggers ready;
He could not miss them. Had he not resembled
My father as he slept, I had done 't. My Husband!
I have done the deed. Didst thous not hear a noise?
I heard the owl scream and the crickets cry.
Did not you speak?
As I decended?
Hark!" II, ii, 12-18.
MacBeth has just commited murder, and he is confronting his wife; he asks if she heard anything in the night. She
replies by saying that she heard the owl scream and the crickets cry, while neither animals are capable of such sounds.
She uses this exaggeration to show the powerful subject matter of murder, and they should not take this lightly, and should
be on watch incase a person suspects them.