Ecology
Invasive Species
Non-native organisms that spread aggressively in new environments, often outcompeting native species and disrupting ecosystems. Typically lack natural predators in their new range.
Biological Context
Invasive species are a leading cause of extinction. Rats, cats, and mongooses have devastated island bird populations. Kudzu vine smothers American forests. Zebra mussels clog waterways. Invasion success often results from escape from natural enemies that controlled populations in native ranges.