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Adult mice have bodies that are 3-4 inches long with 3-4 inch tails. Adult rats are far heavier and longer: they can weigh ten times as much, averaging 350-450 grams for females and 450-650 for males (with an overall range of 200-800 grams). They have 9-11 inch long bodies and 7-9 inch tails (ref).
Cage Design â Floor Area 2.2.1 As a guide, enclosures should allow for a minimum floor area of 250cm 2 for a single housed mouse, a minimum floor area of 500cm 2 for two mice and ensuring a minimum floor area of 60cm 2 per additional adult mouse when mice are housed in larger groups.nimal Research Review Panel 102 ARRP Guideline 22: Guidelines for the Housing of Mice in Scientific Institutions Animal Welfare Unit, NSW Department of Primary Industries, Locked Bag 21, Orange NSW 2800.