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[​January]  PowderPuffs; Topper the Penguin (2)
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[​February]  PowderPuffs; Topper the Penguin (2)
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[​March]
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[​April]     Clover the Bunny; The Peepers; Bumbee the Bee; (3)
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[​June]
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[​July]  Wibbit the Frog; (1)
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[​August]  
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[​September]
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[​October]  Speck the Ghost; Batty the Bat; Ender the Cat;
      Carvin the Pumpkin (4)
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[​November]
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[​December]  PowderPuffs; Topper the Penguin (2)
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If more will appear, I will update the thread
And don't worry if you won't catch them on time, they appear every year and more than one time(even by users that caught them, they appear)
I based it on my trophy widget and infos from members, where I have most of them and I am here for a year ;)

I will correct the calendar if it will be needed or you will correct me, I am aware of any mistakes