"The second prima facie right that all sentient creatures possess is the right not to be made to suffer. Sentient creatures, by their nature, are able to take enjoyment from their lives and to endure suffering: in part, this is what gives them equal intrinsic moral worth. ... in general terms all sentient creatures experience suffering as something that is bad for them and inimical to their welfare. And that explains why the vast majority of us already accept that the interest of sentient creatures in not being made to suffer grounds duties in others."