… case, for example, of the native American cat, Puma concolor, which is … , but hung on in northern Canada until at least 6,000 … , declares them, by turns, “non-native,” “alien,” and “invasive”— and this …… case, for example, of the native American cat, Puma concolor, which is … , but hung on in northern Canada until at least 6,000 … , declares them, by turns, “non-native,” “alien,” and “invasive”— and this …