An Australian woman has pleaded guilty to animal cruelty by filming herself hacking off a mouse's head and posting the footage on Facebook.A Brisbane court on Friday ordered 23-year-old Naomi Anderson to perform 180 hours of community service for the crime committed earlier this month.The court was told that the woman used a steak knife to cut off the mouse's head. The rodent took 40 seconds to die. Anderson uploaded the film of the episode on Facebook using an alias.She could have received a maximum punishment of two years in jail under Queensland state's animal cruelty laws.