What unusual events in nature are mentioned in this scene and the last? What meanings do the characters see in these events?

- It was dark all the time, "By th' clock ’tis day,
And yet dark night strangles the travelling lamp."

-An ordinary owl killed a falcon,"Tuesday last,
A falcon, tow'ring in her pride of place,
Was by a mousing owl hawked at and killed."

Duncan's horses became violent and ate each other. "Turned wild in nature, broke their stalls, flung out,
Contending 'gainst obedience, as they would Make war with mankind..."