Most people, including legal scholars, still have a strong species bias. Yet there are significant developments and new insights which give good reason to expand our conception of rights beyond the human world, to include (other) animals.
In 1975, Peter Singer drew attention to the phenomenon of Speciesism. This ideology defies elementary rules of equality, yet most people are (unconsciously) speciesists. Jurists, as guardians of the equality principle, should be familiar with the ideology.