That’s not true.
Of course if you say you don’t recogniced their rights you may say you can ‘own’ them. Technically you would be slaving them, because they already are their own owners, that fact can not be disputed, you can debate whetever they can be slaved or not, but they do choose their lives, their goals and control their own bodies. So, they already have an ‘owner’, you can say they don’t have a ‘human master’ or a ‘human owner’.
They do have rational capacity and they do communicate, they do have languages, less complex than ours, but they even have names for each of them, words to express emotions, situations around them and so on. So you are lying, they do think, and they do speak, in a way you don’t understand. They can solve small problems, opening bottles, moving chairs, so they do have abstract and geometrical thinking, they do cry for their family members, depress if their sons die… Their emotions are the same, it’s only a matter of bigger abstract thinking.
“liberty is not necessary to their natural end.” How can you say that? How can they feed, move around, mate with the one the like, choose and that agrees, have their family and achieve their goals if they are in a jail in a laboratory for experimentation? What’s their ‘natural end’? being your slave? Well, they appear not to like it, they ran away from you, cry when you experiment on them, so it doesn’t seem to be their ‘natural end’, whatever this expression means.
“Humans have rights because we do have the capacity for rational thought” Please explain in detail and draw the line so we can judge who is apt and who isn’t, once you say that, if a human fails, he fails, he has no right, you can’t go back and change the rules and say, well, he has rights.. because.. he’s human and that’s all!!
“Thus, our natural end is, in a very large part, self-directed, which necessitates a right to liberty, from which all other rights are derived”
Self-direct yeah, that’s why 90% of adult humans have babies, a wife and a home to sleep confortably in.
When a dolphin decided to risk their life to save a human from a shark it’s just pure instinct, never a rational decission.
So, birds cannot have a nest for their children, but you can have a home for yours, you both modify nature to achieve it, but you are the one with ‘rights’ and can destroy their home/nest, steal their eggss and eat them. Because… well, both try as hard as they can to live better and feed and take care of their families and protect them, but only one of them is granted rights, you, well, because you want to and it’s usefull to you, so you can continue abusing them.