What are animal rights? Generally, this term implies that animals have rights to live, they cannot be considered as means of receiving food, producing garments; as a financial profit, in entertainment industry (zoo, circus) and in also in scientific experiments.
People who protect animal rights assert that an animal is not a property, but a personality. The history left us a vast array of philosophical standpoints and concepts of animal rights.
The first society for protecting animal rights was created in 1824: Society for the Prevention of Cruelty to Animals
Even a well-known Adolph Hitler forbade animal hunt and experiments in 1933. Cannot tell you whether he acted based on ethics or love towards animals. I think not, as the medical experiments had to undergo Jewish people and Gypsy children.
Do you love animals? Do you care about them? Do you see any justify of cruelty to animals?
He who is cruel to animals becomes hard also in his dealings with men. We can judge the heart of a man by his treatment of animals.