agriculture alewife aquaculture auckland australia avian range expansion biodiversity biological dispersal biotope black widow spider brown rat california canada goose cane toad cat caulerpa taxifolia central park chestnut blight common brushtail possum common pheasant conservation biology deer dog dutch elm disease eastern gray squirrel ecological niche ecosystem erosion eugene schieffelin europe european starling extinction extraterrestrial life feral fish gene gene flow genetic pollution goat gorse great lakes gypsy moth hawaii house sparrow indigenous peoples of the americas interspecific competition introgression invasion biology terminology invasive invasive species island restoration japanese knotweed katipo kudzu list of introduced bird species list of introduced species mediterranean sea monaco muskrat myxomatosis new york city new zealand north america ohio ornamental plant pet pig possum rabbit rainbow lorikeet rat resveratrol san francisco bay scotland seaweed silver pheasant smallpox species suez canal thomas austin united states united states environmental protection agency virus waitakere ranges wall lizard water hyacinth william shakespeare yellowstone national park zebra mussel