To be honest, I couldn't be bothered watching the entire film - I'd still like to comment, though:
Wholly idealistically, I'd say we should strive to give animals the same sort of rights that human beings have. There is little doubt that by far most species on Earth have the same basic mental structure of pleasure and pain, and bringing sentience in as a qualifier of whether a species deserves to be protected is only valid because we, as humans, have an invariably humanocentric view on things. Keep in mind that humans who've lost their higher cognitive abilities, or never had any, for that matter, are still protected and supported in much the same frame of mind as a thinking person. It's far easier to put down a horse that broke its leg than it is to pull the plug on a comatose vegetable of a human.
Practically, however, Errrrrrr's viewpoint of human dominance already suffuses existence on Earth - and the vast majority of humans are fine with that. The reason humanity is so succesful is because we've strong-armed other species, animals and plants alike, to suit our needs, to the point that they've evolved into radically different forms that would not be able to survive without human care. I'll be the first to admit that I don't feel any particular guilt about it, though, despite the fact that my idealistic side probably ought to. I'll go so far as to say that I take a certain satisfaction in symbolically exerting the dominance of my species whenever I chomp down on a hamburger. That's probably just another side of me - maybe the one that always makes me pick humans in interstellar wargames and such...
For this general trend to change, I think humanity as a whole needs to encounter another sentient species with a radically different form - maybe like a cat, or a fungus. The other species on Earth are simply too different from humans for there to be the sort of empathy that some people would like. The whole cutesy paternal instinct that applies to pets isn't really cutting it - we still think of the poor creatures as inferior, and we wouldn't go half as far to save their lives as we would with any human. That's just how we're brought up, and unlike other negative, traditional influences of that sort (religious tendencies, for example), there's nothing in the whole of the, arguably diverse, human culture that challenges that. I think it's quite valid to compare racism and speciesism, but since we don't have dogs saying "I have a dream", people are quite willing to let animals suffer to uphold the luxurious dominance of humanity.
Thought for the day:
I fear no evil, I fear no death, for the Emperor comes for me.