When did scientists start to experiment on animals?

Answer 1

Because it is not legal or ethical to perform toxicology research on humans, scientists use animals such as fish, mice, and other organisms whose bodies respond similarly to those of humans. These are called animal models.

Answer 2

Scientists have been experimenting on animals for centuries, with recorded experiments dating back to ancient Greece and Rome. The use of animals in scientific research became more formalized in the 19th and 20th centuries as the field of Biology and medicine advanced. Today, animal experimentation is a common practice in various scientific disciplines.