Simplify the following text for a Grade 9 native English-speaking person.
Original: Several European and Asian species have been introduced to these areas as well as North America , Hawaii and New Zealand , where they generally compete for habitat with native birds and are considered to be invasive species .
Simplified: Several European and Asian species have been introduced to these areas as well as to North America , Hawaii and New Zealand . In these new areas they compete for habitat with native birds , and are invasive species .