As proof, in the pro article, it states, “ Animal testing has also been instrumental in saving endangered species from extinction.” In other words, animal testing/ research has been useful in the revival of several endangered species. Animal testing has largely improved the researchers’ understanding of animals, thus benefiting them. For example, as a result of scientific animal research, scientists can finally breed animals in captivity. This benefits endangered animals because the can be efficiently be repopulated while under protection by an animal sanctuary. Due to this, animals will no longer be at the risk of extinction, so it will be safe enough to release them into the wild. In addition, if there was a lack of animal testing, then there would be millions of animal deaths due to disease. To be specific, the deadly STI (sexually transmitted infection), Chlamydia, is existent in 90% of Australian koalas. Chlamydia is a bacterial infection that is found in both male and female koalas; it causes blindness and infertility. Additionally, this infection impairs the functionality of Koala’s immune system, in turn, killing them. Koalas are an endangered species and were at a high risk of extinction. Animal testing helped scientists create a vaccination for this STI, delaying the extinction of this species. Therefore, the