Birthday mice were released on 5 March 2009 as a precursor to MouseHunt's 1st Birthday on 7 March 2009. I have caught one and got the loot of one Birthday Gift and Fancy Birthday Gift. You can open your Present by going to Inventory Tab and select Misc. I got 1 Birthday Cake Base and 2 Scrap Metal. Some users got bigger present like the Polar Base.
What is your Birthday Mouse Presents?