Rights are strictly a concept born of our self-aware, intellegent minds.
If man didn't exist, there would be no entity on earth (as far as we know) to contemplate animal rights. Carnivores would prey on smaller carnivores and herbivores. Including stealing and consuming new borns, the elderly and weak. No right to live, no right to pursue happiness, no right to "liberty" lol, no concept of liberty, let alone rights.
Rights are strictly human, a human construct and in my opinion strictly about us dealing with each other. That's why "animal rights" is about my personal sensibilities with regard to what is and isn't acceptable treatment of animals.