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How do Species become Extinct?

Almost all extinctions today are caused by human activity:

Habitat loss
The biggest cause of extinctions is from species losing their homes, or habitat. Clearing forests, draining wetlands, damming rivers, turning grasslands into farming areas and putting human structures in the natural environment all remove natural habitat. Most species are adapted to a specific habitat and cannot live anywhere else.

Introducing Non-Native Species
Most of the worst pests in the United States have been introduced from other countries by people. These animals and plants do not have any natural predators so they often spread very fast and take over habitat and food sources from native species. Many native species have become endangered or extinct because they have been killed, had their food eaten or lost their habitat due to introduced species. You can help by never letting any pets or aquarium fish into the wild.

Hunting and Harvesting
Some animals, like rhinos, tigers and bears are hunted in the wild for their skins, tusks and other products. Many of these large animals take a long time to reproduce and so are very close to extinction. Sea animals like whales and seals are also hunted for their meat and skins, while overfishing has caused many of the world’s fish species to decline in large numbers.

World Wildlife Fund, 2002.

More information on Overfishing.

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