why rats are used for experiments ?
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Rodents are commonly used in animal testing, particularly mice and rats, but also guinea pigs, hamsters, gerbils and others. Mice are the most commonly used vertebrate species, due to their availability, size, low cost, ease of handling, and fast reproduction rate.
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Rats are physiologically very similar to humans, particularly their respiratory systems so they get a good indication how things would (or wouldn't) work on a human by testing on rats. also they are small and don't take up much space so there is probably a cost advantage too.
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