1) Animals already have something resembling rights, in the form of animal cruelty laws; the question here is whether those rights should be expanded to include some of the things guaranteed to humans.
There is a spectrum of opinion on what "animal rights" means. At the very least, I think animal rights include the right not to suffer needlessly at the hand of humans. I doubt anyone would argue that is also a human right. So, continuing in that direction, I don't think it's a stretch to imagine that many human rights can be accorded to animals also.
Arguably, what we humans call animal rights are really just human-law restrictions on our own behavior (and good ones IMHO.) However, I think it captures their intent to call them "rights" so I embrace the term.
2) Plenty of humans (children, or, as someone else pointed out, the handicapped) can't hold down jobs or feed themselves. Chimps and dolphins, on the other hand, typically are able to feed themselves. So what you're saying is, chimps and dolphins should have more rights than children and the disabled?
I don't think it's a question of "more" rights, just different ones, and with the qualifier I mentioned above that we're really talking about human laws, not animal rights. I would say that animals have their own innate sense of rights and justice, and what we think of as their rights is an idealized picture of our relationship with them.
We need another and a wiser and perhaps a more mystical concept of animals. In a world older and more complete than ours they move finished and complete, gifted with extensions of the senses we have lost or never attained, living by voices we shall never hear. They are not brethren, they are not underlings; they are other nations, caught with ourselves in the net of life and time, fellow prisoners of the splendour and travail of the earth. -- Henry Beston