In these science fiction books, extraterrestrial beings are sympathetic, horrifying and everything in between.

Republican Rep. Nancy Mace of South Carolina has introduced legislation that would make illegal immigrants who engage in animal cruelty inadmissible to the United States and subject to deportation.

Introduction: Nonnative species in the world / David Pimentel -- The impacts of alien plants in Australia / Richard H. Groves -- Environmental and economic costs of invertebrate invasions in Australia ...

An international research team led by the University of Vienna has produced, for the first time, high-resolution global maps of invasion risk for thousands of alien plant species under current ...