The notion that human life is sacred just because it is human life is medieval.

Philosophers
Peter Singer
Australian-born ethicist (1946- ), bioethics professor at Princeton. Animal Liberation (1975) launched the modern animal rights movement; his poverty work grounds the effective altruism movement.
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Source: Rethinking Life and Death (St. Martin's Press, 1994)Verified
Peter Singer's Other Quotes
All the arguments to prove man's superiority cannot shatter this hard fact: in suffering the animals are our equals.
If it is in our power to prevent something bad from happening, without thereby sacrificing anything of comparable moral importance, we ought, morally, to do it.
The capacity for suffering and enjoyment is a prerequisite for having interests at all.