Invasive species are plants or animals that are not originally from a place and can cause big problems in nature. They can take over and crowd out native species, mess up ecosystems, and change the habitats where local plants and animals live.

Here are some important facts:

• In the United States, invasive species cost us about $120 billion each year. That’s a lot of money!
• Almost 42% of species that are in danger of dying out are being harmed by invasive species.

So how do invasive species cause these problems?

• Predation: They usually have no natural predators to keep them in check. This means they can grow in number quickly.

• Competition: Invasive species can beat native species for food, space, and other resources they need to survive.

One example of an invasive species is the zebra mussel.

• The zebra mussel has spread all over North America.
• Because of this, the numbers of local mussels have dropped, which affects the ecosystem and makes the water quality worse.

In summary, invasive species are a serious threat to the diversity and health of nature all around the world.