Rights and duties are not always balanced. Kids for example have far more rights, as you can expect duties from them. And a dog, which just lays in front of the fireplace for comforting the owners, has still no less rights IMHO, as an avalanche rescue dog.
After all, how do you define a useful duty for an animal? Cats are a great example - you can't teach them to do any desired duties, but you can be sure that cats have an understanding themselves what they can do to please you... who never woke up to see a dead mouse in front of his bed and a proud cat sitting behind it, does not know what it is like to own a real cat.
So, IMHO, the main goal for any animal rights should not be based on a human concept of usefulness. I think many US citizens have any reason to hate termites, but without the possibility to study them, we would most likely never learned as much about how to build energy efficient skyscrapers as we did from them.
So, I think, there should be some initial credit in granting animals rights. Of course, this would remove freedom from us humans to ignore animals in our expansion. But so far, what had ignoring nature ever brought us, except catastrophic events, because of our hubris and lack of knowledge?