Of course, infanticide needs to be strictly legally controlled and rare - but it should not be ruled out, any more than abortion.

When children see animals in a circus, they learn that animals exist for our amusement. Quite apart from the cruelty involved in training and confining these animals, the whole idea that we should enjoy the humiliating spectacle of an elephant or lion made to perform circus tricks shows a lack of respect for the animals as individuals.

I don't understand the notion that modern farming is anything do to with nature. It's a pretty gross interference with nature. I think it ought to be governed by the standards of how it affects the individual animals, just as we'd want to deal with institutions that deal with humans by how they affect individual humans.

The traditional view of the sanctity of human life will collapse under pressure from scientific, technological and demographic developments.

I think ethics is always there; it's not always a very thoughtful or reflective ethics.

All the arguments to prove man's superiority cannot shatter this hard fact: in suffering, the animals are our equals.

Cheats prosper until there are enough who bear grudges against them to make sure they do not prosper.