How Does A Duck Know?

How does a duck know what direction south is?
 
 And how to tell his wife from all the other ducks? Mmm
 You can cut a chicken's head off
 And it will keep on running and twitching
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 When everything seems planned out
 Everything seems nicely planned out
 Will the human race come and smack your face
 How come all my body parts so nicely fit together?
 
 All my organs doing their jobs, no help from me! No
 A person pulls a spider's leg out
 To watch it keep on moving and twitching
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 And everything seems planned out
 Everything seems nicely planned out
 Will the human race come and smack your face
 Satan lives here
 On grain and earth, rain and air
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 How come I just smoke and smoke and smoke and curse every butt I spit out?
 All night long I grind my teeth and I wake up when I cough
 
 You can put me in an iron lung
 And I will keep on breathing and twitching
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 And everything seems planned out
 Everything seems nicely planned out
 Will the human race come and smack your face
 You might be dead, better keep your head