Mice and rats are are the animals used most in laboratories. The statistics for 2016 for both rats and mice used is 1,494,125. They try to make themselves look better by saying they have improved their living conditions
In an attempt to make life as comfortable as possible for animals in laboratories, scientists consider environmental enrichment. This means that they are provided with bedding, variety of food, company of other animals and sometimes toys.
But even small things can stress the animals, such as a radio playing in the laboratory, doors slamming, buckets clanging and lights going on and off. Remember that many animals have sight, sound and smell that are far more sensitive than ours. Not only do these things stress the animals, they also can affect their hormones which can then make the experiments invalid.
Even in the very best living conditions, laboratory cages cannot compare with how the animals would live in their natural environment where they are free to roam and make their own choices.
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