Species Extinctions Species extinctions are what we are trying to avoid with our conservation efforts. Yet species extinctions have been common through the entire history of life on Earth. Extinction is part of the process of evolution. New species replace those species that are less well adapted to the changing conditions. Even though extinction is common through the Earth's history, it is still a very valuable tool that gives us some focus for the protection of the planet.
Extinctions are a good indicator of the health of the Earth.
It is easy to make the case that we should save rare and endangered species. Most people don't like to see species go extinct. People generally feel that it is their responsibility to protect species so that people in the future can enjoy them. The California condor is an example. It is one of the largest birds.