On the one hand there are many reputed cosmetic companies that experience with animals to test their cosmetics.
In addition it is an important fact that 98% of human diseases have never been shown in animals. Nevertheless, the experimentation with animals is present in our world yet.
To sum up, I think that experimenting with animals is immoral because animals are capable of feeling pain and pleasure. They are intelligent and aware with emotional life, and they are bred to die and abducted from their natural habitats.