There are people who have varying issues with animal testing but I have not seen anyone talk about the different animals used in testing in the past or present. Animals ranging from invertebrates to vertebrates such as cats, dogs, and non-human primates have been used in the past. Where is the line drawn? For example, people may cringe at the idea of using apes, but they are very closely related to humans, which is critical in some testing. Where does scientific necessity counter animal (or in the example case primate) rights?