It is commonly believed that animal ethics entails respect for natural processes, because nonhuman animals are able to live relatively easy and happy… - Oscar Horta

This means that the number of animals that come into existence only to die shortly after is extremely high. On average, if we consider a context in which populations remain stable at least in the mid term, for each animal that reproduces, only one of her or his offspring survives (otherwise animal populations would grow exponentially very fast, and would become massive with just one generation). This means that all the rest of the animals die. Many of them die shortly after coming into existence. These animals starve to death, are eaten by other animals, or die for other reasons that usually entail a great deal of suffering. This means that an enormous number of animals come into existence only to suffer. Their lives contain virtually no enjoyment, since they die shortly after they start to exist. However, their lives do contain significant suffering, because of the painful ways in which they die. They thus live lives in which disvalue outweighs value. Living their lives causes them more harm than good. In fact, in many cases it causes them great harm and no good at all.

What happens to all the other animals that come into existence? They die, often shortly after they start to be sentient. They starve, are killed by other animals or in other painful ways, and, because they die so soon, they do not have the chance to have many other experiences apart from the suffering of their death. This means that they may never have any positive experiences at all, or just have very few ones. Other animals may be able to survive a bit longer and have some more positive experiences, yet not enough to outweigh the suffering they endure because of the hardships of their existence which eventually lead them to their death. These animals experience more suffering than well-being in their lives.

Many people think we shouldn't worry about [wild animal suffering]. Some people hold speciesist views according to which we should only care about what happens to human beings. Others hold environmentalist positions that entail that we should just care about the conservation of ecosystems or species and disregard the interests of individual nonhuman animals. According to those holding these views, nonhuman animals can be sacrificed for the sake of environmental conservation (though, interestingly, they seldom maintain this view when human beings are affected). However, if we agree that the interests of all sentient animals must be taken into account we should reject these anthropocentric and environmentalist views as speciesist.