An easy way to get Birdo and many more things.
Go on the Time Trials. Do a Time Trial for each race in the Mushroom, Flower, Star, Shell, and Banana Cups. Then, turn off your Wii after you have gone back to the title page. Turn it back on and go to your profile (the one you did all of this on), and it will say all of the things you've unlocked. Good luck!
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