Much has also been said about the cruelties inflicted by animals upon one another. But I must emphasize that, in their original wild state, and with rare exceptions, animals kill only for food, not for the sake of killing. That is a prerogative peculiar to humankind.

Yet, like all God’s wonderful gifts to us, this great gift of pain can be turned into a horrible curse. Just in proportion as God’s love provides the possibility of good, so our vice or ignorance makes the possibility of evil. The abuse of God’s gift of pain may be the cause of the most terrible of evils, and we call it cruelty.

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When considering the extent of an animal’s capacity for suffering, it is impossible to draw a distinct line between domestic animals and so-called vermin. Such a line is purely a matter of sentiment. The fact remains that all vertebrate animals are highly sensitive.

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While some animals are protected by law, far too many still remain outside the pale of such protection. And so, I ask: should not their capacity to suffer be the measure of their right to be protected? This is not a plea for charity but for justice—a right that must be claimed.

As to the actual intensity of pain felt by animals, let us take each of the five senses. When compared to humans, most of these senses are far more acutely and highly developed in animals. Additionally, animals possess other remarkable senses, such as the homing instinct and an awareness of their approaching death.