Gray squirrels are known for their bushy tails and hoarding habits. These North American natives were imported to parts of Europe and South Africa as pets, but quickly went from pets to unwanted pests. Learn more about the problems caused by invasive gray squirrels and what can be done to solve them. |Index|Sources for further research|Glossary of key words|Informative sidebars|Table of contents|Author/Illustrator biography|This series looks at animals that have spread beyond their native habitats and taken over new territory. Animal Invaders provides a global perspective on the topic by including invasive species that have been both imported to and exported from North America.