 Limited food leads to low population density, which has been estimated for Amblyopsidae to be only about 0.005 to 0.150 animals per square meter.Cave habitats are vulnerable to changes in the environment such as water pollution and exotic species.The Alabama cavefish ("Speoplatyrhinus poulsoni"), which live only in the Key Cave in Alabama, is listed as Critically Endangered by the IUCN, the highest risk class.