Introduced species are those which were brought to Bermuda, either on purpose or accidentally, by people. Most of the ornamental garden plants and all of the agricultural crops and domestic animals found in Bermuda today are introduced species. Most of the familiar plants and animals associated with Bermuda, such as whistling frogs, hibiscus and oleander are examples of introduced species. Some introduced species are able to reproduce on their own once they arrive in Bermuda - these are called naturalised species. Most naturalised species are not a problem, but a small number become a nuisance. We call these introduced pests an invasive species.