Related by context. Frequent words. (Click for all words.) 63 Endangered 61 extinct 56 Lemurs 55 Imperiled 55 Salamanders 54 Extinction 54 Euthanized 53 Critically Endangered 53 clouded leopards 53 cassowary 53 Species 52 Fossilized 52 Coral Reefs 52 Than Thought 52 species 52 extinct species 51 subspecies 51 Bird Flu Outbreak 51 skink 51 Orangutans 51 critically endangered 51 Bornean 51 Brain Cells 50 Making Comeback 50 Infested 50 Domesticated 50 Scaled Back 50 Mammals 50 Tiniest 50 megafauna 50 Whooping Crane 49 Experts Warn 49 vertebrate species 49 Giant Squid 49 frogs toads 49 Cannibalism 49 Invaded 49 Prehistoric 49 thylacine 49 Dwindle 49 Tortoises 49 Tamed 49 Cloned 49 Mummified 49 Found Alive 49 mammal 49 Expert Says 49 Reintroduction 49 Infects 49 Oiled 48 Flocking 48 Droppings 48 Mammoths 48 Trapped Miners 48 Mammal 48 clouded leopard 48 Rescue Effort 48 Ancestor 48 nearing extinction 48 Mystery Solved 48 Dinosaurs 48 Newly Discovered 48 Peregrine Falcon 48 Vanishes 48 Rainforests 48 Bones Found 48 Stave Off 48 anteaters 48 Ostriches 47 Slaughtered 47 flightless birds 47 Endangered Species List 47 frog species 47 quolls 47 Get Rid Of 47 Parakeet 47 Diseased 47 Homo Sapiens 47 Study Suggests 47 Mutilated 47 reptiles amphibians 47 flightless 47 Mongabay 47 amphibian species 47 critically endangered species 47 Meerkats 46 breeding colony 46 Remains Found 46 Discovered 46 Hairless 46 Fend Off 46 Disappearing 46 Collared 46 Squashed 46 Sea Turtles 46 extinction 46 Harmed 46 Traced 46 Short Lived 46 lynxes 46 platypuses