How about this one?
My personal view is that any attempt to draw an arbitrary distinction between humans and other animals is just speciesism, which in my opinion is no better than other forms of discrimination, such as racism, sexism or homophobia. I have reached this conclusion not through sentimentality, but by logical consideration. Bonobos pass the mirror test for self-awareness; they communicate with each other through vocalisation and can communicate with us using lexigrams; they can use tools; an adult bonobo is more intelligent than a human baby. Given these facts, under what criteria is it unacceptable to experiment on a human baby, but acceptable to experiment on an adult bonobo? Pure chauvinism, in my opinion.
Better men than me have expressed moral discomfiture about speciesism; Richard Dawkins makes a good case in this essay.
I'm not suggesting we ban animal experiments or start experimenting on babies! Organisations like USDA and CAAT work to ensure that animal experiments take place only when there is no alternative, and that those experiments that do take place are done in such a way as to minimise suffering. At the same time, I think we should openly acknowledge that we are committing speciesism, which, although morally wrong, is sometimes necessary.