Newer species that could survive in a warmer environment took their places. For example, after the Ice Ages, when the glaciers melted and the earth became warmer, many species died because they could not live in a warmer climate. Other times, extinction will happen slowly as nature changes our world. Sometimes a natural event, like a volcano erupting, can kill an entire species. Species disappear because of changes to the earth that are caused either by nature or by the actions of people.
Threatened species are plants and animals that are likely to become endangered within the foreseeable future throughout all or a significant portion of its range. Endangered species are those plants and animals that have become so rare they are in danger of becoming extinct. There are over 1,300 endangered or threatened species in the United States today. At that time, there were no hunting laws to protect endangered species like there are now. Second, many pigeons were shot for sport and because they were good to eat. First, the forests where it lived were cut down to make way for farms and cities. The passenger pigeon became extinct for two reasons. All living passenger pigeons disappeared from the earth entirely. There were so many passenger pigeons that people often saw great flocks of them flying overhead containing thousands, even millions, of birds. A century ago, a bird called the passenger pigeon lived in North America.
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