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Humans have moral capacities that animals do not. However, not all humans have these said capacities, so having these capacities is not a prerequisite for these rights. To be morally consistent because some animals have the same capacities as those that are mentally challenged, we should treat animals the same as humans. If you don't give animals the same rights as humans, we are being speciest.
What is the AMC? (Argument of Marginal Cases)