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Extinction is the disappearance, brought about by natural or unnatural means, of an entire species.
Some species of plants and animals die out naturally because newer species are more successful at competing for food and living space. Others have become extinct because of changes in the planet or because of natural disasters. Dinosaurs, for example, may have died out because the climate became cooler--maybe because an asteroid collided with the earth and caused a big cloud of dust that blocked out the sun.
In today's world, however, species mostly become extinct or are threatened with extinction because of humans. Humans hunt animals, destroy their habitats, and introduce other animals that prey upon the endangered animals or compete for their resources. Among these factors, the greatest threat to plants and animals is habitat destruction.
It is estimated that about 125 species of birds and 60 species of mammals have become extinct since 1600. Currently, there are approximately 1000-1100 species of birds and mammals that are facing extinction. If invertebrates and plants are included, the total number of species in imminent danger is around 20,000.
Sample these internet activities and complete the tasks for each one to learn about a few of the animals that no longer exist