Well if it is on animal ethics you might read up fom Peter Singer "Animal Liberation" might give you the basics if you look up the Wiki Here the WIKI LINK Animal Liberation Peter Singer is one of the most controversy because of his ultarian approach on euthanasia and infanticide on human beings and uses methods of arguments that date back to Hobbes Kant and Rawls and the likes. I don't like him much for a that! Too outdated approach for the 21st century. He was given this weekend a prize from the Giordano-Bruno-Foundation about his Great Ape Project in Berlin.