Invisibility--there are things we can't see now, that are there, that are embedded, that it really takes time in order to be able to see. There are many ghosts that are lurking around and lingering through us that takes the technology of another generation or so in order to uncover and show what those stains and strains and perceived flaws really we're building towards
Not only are animals unable to avail themselves of language to assert their own rights, but many fewer humans have a clear sense of kinship with animals than have a clear sense of kinship with other humans. Among beings with subjective states of awareness, animals are the untouchable caste, those whom human others would rather not acknowledge, let alone render assistance.
If America is the land of opportunity, a country where perseverance and hard work is rewarded by recognition, then an illegal harbors the opposite ambitions. His greatest reward us anonymity, invisibility. Aided and abetted by market forces and the laws of supply and demand, he hones his skill to stand up but make sure he's never counted.