Invasive animals are animals that are from a different part of the world and have evolved in a different ecosystem. They may thrive in different habitats which are less harsh than their own. They may be able to tolerate higher or lower temperatures than native animals.

Why are invasive species a problem?

Invasive animals out-compete native animals leaving less food and habitat for native animals. They may disrupt the ability for the native animals you are familiar with to survive as they fight for limited resources.

How Starlings systematically kill native birds

Systematic instinctive diabolical nesting habits of European starlings looks like:

Your native robin has a nest with a few eggs, they leave the nest to go eat, starlings were observing, the male enters the native bird nest hole in a tree, looks around and double checks if there are eggs in the nest and the parents are not home.

The male starling picks up a native egg, flies out, and drops it on the ground.

The female starling flies into the native robin nest and lays her own egg in the native bird nest then leaves.

The native robin comes back to the nest and sits on the invasive starling egg not realizing their egg was replaced with the startling egg exponentially lessening the native bird population as the robin rears the starlinging fledgling as its own.

History of European Starlings in the United States

European countries gave 10 starlings to the United States as a gift at the 1964 world's fair in New York.

They released these birds in Central park.

Now almost a century later, half of the birds in the US are starlings, they have agricultural pesticides called Starlicide to kill thousands of these birds as they eat all of the crop seeds.

Starlicide (Wikipedia)

cited articles about Invasive Animals and birds

https://wdfw.wa.gov/.../publications/00636/wdfw00636.pdf

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