I don't understand why my code isn't working.......please help!!!!!!

The if, if-else, else conditional is making my code not run, and I don't understand why. It appears almost the same as Dave's, so I'm at a loss. Here is my code in its entirety:

var correctAnswer = 0;

var question1 = prompt("What animal has a rattle?"); if (question1.toUpperCase() === 'RATTLESNAKE') { correctAnswer += 1; }

var question2 = prompt("What animal has tusks?"); if (question2.toUpperCase() === 'ELEPHANT') { correctAnswer += 1; }

var question3 = prompt("What animal hibernates?"); if (question3.toUpperCase() === 'BEAR') { correctAnswer += 1; }

var question4 = prompt("What animal lives for more than 80 years?"); if (question4.toUpperCase() === 'PARROT') { correctAnswer += 1; }

var question5 = prompt("What animal has a shell on its back?"); if (question5.toUpperCase() === 'TURTLE') { correctAnswer += 1; }

document.write("You got " + correctAnswer + " questions correct.");

if (correctAnswer === 5) { document.write("<p>You get a Gold Crown</p>"); } else if (correct answer >= 3) { document.write("<p>Silver Crown</p>"); } else { document.write("<p>You don't know me at all.</p>"); }