The argument over abortion and fetal tissue use. Since killing abbreviates a life, there are four sorts of deprivation that can result from the killing of a sentient organism.
Oysters are unlikely to qualify.
Some philosophers have argued that language is essential to the capacity for self-consciousness. In order to mark a difference between wanting something immediately and wanting something Tuesday week , I have to have something like a calendar, a representation of the course of time. This takes small children time to develop. Nor can a dog hope his master will give him a bone next weekend. So if human persons's lives have a special claim to be protected, then so do some animals'.