Antispeciesism is the opposition (or the struggle against) the discrimination of those who don't belong to a certain species. Antispeciesism opposes … - Oscar Horta

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.

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.

Then, I claim that if we abandon a speciesist viewpoint we should change completely the way in which we should intervene in nature. Rather than intervening for environmental or anthropocentric reasons, we should do it in order to reduce the harms that nonhuman animals suffer. This conflicts significantly with some fundamental environmental ideals whose defence is not compatible with the consideration of the interests of nonhuman animals.