The life expectancy of the average mouse in the wild is generally short and can be calculated in weeks or months. Pet mice, however, can live up to 3 or 5 years. They have in-built homing instincts but are almost certainly colour-blind, viewing their world only in black and white.
Like most rodents, mice need to take in little water. They produce almost all they require under normal circumstances by "burning" the carbohydrates in the food they eat and using the water that is released in their bodies as a by-product of the "burning". This metabolic water is produced by larger animals, including man. But to these larger animals, it is a minor source of water as their relatively massive bodies demand far more water than such an internal spring can provide.
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