text: Here are some listed as Critically Endangered by the IUCN (World Conservation Union):\n\nBaltic Sturgeon (Acipenser sturio)\nDuck-billed Buntingi (Adrianicthys kruyti - possibly extinct)\nChinese Alligator (Alligator sinensis)\nAxolotl (Ambystoma bombypellum)\nAustralian Freshwater Limpet (Ancylastrum cumingianus)\nChinese Giant Salamander (Andrias davidianus - largest amphibian in the world)\nCave Squeaker (Arthroleptis troglodytes)\nPondicherry Shark (Carcharhinus hemiodon)\nDumb Gulper Shark (Centrophorus harrissoni)\nMalayan Water Shrew (Chimarrogale hantu)\nCentral American River Turtle (Dermatemys mawii)\nLeatherback Turtle (Dermochelys coriacea - largest turtle in the world)\nGoliath Grouper (Epinephelus itajara)\nGreek Lamprey (Eudontomyzon hellenicus)\nNoel's Amphipod (Gammarus desperatus)\nCoelacanth (Latimeria chalumnae)\nBloody Bay Poison Frog (Mannophryne olmonae)\nMediterranean Monk Seal (Monachus monachus)\nEthiopian Amphibious Rat (Nilopegamys plumbeus)\nMekong Giant Catfish (Pangasianodon gigas - largest living freshwater fish)\nHarbour Porpoise (Phocoena sinus)