[lucksack]

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If you're going to say "if humans have value then animals have value too", you are essentially saying "the same reasons that humans have value also apply to other animals". Since we don't know the reasons humans have value, this argument can't be evaluated.

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Even if we don't know why humans have value, but we do know that humans have value and that the reason is none of the characteristics that humans have but other animals lack, logically follows that others have value too.

But I have not claimed humans have objective value.

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I don't know why you're combining subjective morality with believing in humans as a higher species. I think most moral relativists would consider "higher" a completely subjective term.

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Ok, well, they don't need to say that morality is subjective, just admitting to irrational belief in humans as a higher species or something like that (the type of thinking that one human is somehow worth more than a billion pigs) is enough.