Before we address whether or not they have rights, we must first establish whether or not they even qualify as sentient life. They lack:

1.) A means of communication with each other.
2.) Emotion
3.) Intelligence
4.) Life
5.) Hunger?

They crave living flesh, but do they need it? If they are dead, then they lack the ability to digest food. Which means they don't require the energy that living things require to act.