In the modern world, many animals are used for scientific purposes, especially rats, rabbits and monkeys are popular among the researchers, as their organism is similar to the human body. In this regard, many people are willing to prohibit such kinds of experiments, as it can damage the animal bio-diversity, leading to become extinct. However, others feel that in order to develop medicines and prevent new illnesses, such kinds of experiments can be beneficial for the patients. Personally, I believe that animals specious should not be damaged by the trails-trips of the people, especially endangered species.