Move over Martians, Earth has already been invaded by little green aliens, but how did parakeets become one of the most successful invasive species ever?
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https://www.newscientist.com/article/mg24532770-600-little-green-invaders-how-parakeets-conquered-the-world/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home
