A mouse measures in at about 3 1/2 inches, not including tail, and weighs just 1/2 to one ounce. While white (albino) mice are the most common type, fancy mice can be twice the average size, and come in a wide variety of coat colors and types, from curly and shiny to silver and cinnamon.
Mice are curious, charming pets, and will be active at various times throughout the day. However, they are fragile and should be treated gently, and children caring for them should always be supervised by an adult. Mice are happy, playful and active creatures and are great to watch. Mice get to know their owners and when well socialised will come to take treats from you, climb onto your hand and up to your shoulder. However, they are by nature timid and so you need to spend time getting to know them.