Ferrets 2015 Wall Calendar Ferrets wall calendar for 2015. With unique images, this calendar features these determined and inquisitive companions; so entertaining and intelligent, they capture your heart with their charm. 18 month calendar; July 2014 through December 2015. Measures 12 X 12 inches closed, 24 X 12 inches opened. Monthly grids are large enough to record daily tasks and appointments. Includes major holidays and moon phases. Perfect for anyone who loves ferrets!