How Many Animals Are Used in Research? It's impossible to know exactly how many animals are being used in research because U.S. laws do not require scientists to report how many mice, rats, or birds they use. But even though no one is sure how many rats and mice are used in research, most sources agree that about 90 percent are rats and mice. There are many animals that scientists do have to report using in experiments, including dogs, cats, sheep, hamsters, guinea pigs, and primates. Of the animals that the US Department of Agriculture (USDA) collects numbers on, 1,438,553 were used in research in 2002. Since more than 1.4 million mammals other than rats and mice were used in research, and since mice and rats probably make up 90% of the animals in labs, we can guess that about 14 million rats and mice were used in research in 2002. That means that over 15 million warm-blooded animals are used in research every year. ANIMAL TESTING: Why Animals Are Used in Research? Why would anyone make hundreds or thousands of animals suffer? Nearly all of the scientists who do research ......

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