Related by context. Frequent words. (Click for all words.) 48 clouded leopard 46 breeding colony 45 Tasmanian tiger 45 Critically Endangered 45 extinct species 45 Homo floresiensis 44 Extinct 43 theropods 43 critically endangered species 43 coelacanth 42 tapirs 42 carnivorous dinosaurs 42 frog species 42 marine reptiles 42 mammal species 42 extinct 42 thylacine 42 palaeontologists 41 Sumatran rhinos 41 Homo erectus 41 Homo habilis 41 tyrannosaur 41 breeding colonies 41 vertebrate species 40 pygmy elephants 40 megafauna 40 genus Homo 40 amphibian species 40 hominid 40 critically endangered 39 Cretaceous Period 39 fossils 39 Orangutans 39 sauropod 38 flightless bird 37 mammals 37 mammal 37 zoologists 36 Endangered 36 vertebrates 36 rhinoceroses 36 hadrosaur 36 species 36 tyrannosaurs 36 Archaeopteryx 36 hominins 36 subspecies 36 avian species 36 fossil 35 sauropods 35 flightless birds 35 plesiosaur 35 overhunting 35 Threatened Species 34 Extinction 34 Longrich 34 genus 34 primate species 34 Lemurs 34 dinosaur 34 genetically distinct 34 hominids 33 terrestrial ecosystems 33 saber toothed cats 33 interbred 33 herbivorous 33 trilobites 33 breeding pairs 33 woolly mammoth 33 baiji 33 Species 33 flightless 32 Poinar 32 dinosaurs roamed 32 extirpated 32 dinosaurs 32 IUCN Red 32 bird species 32 prehistoric 32 amphibians 31 undiscovered 31 flycatcher 31 domesticated 31 Grand Marais Like 31 mammoths 31 unexploited 30 federally endangered 30 exterminated 30 Homo sapiens 30 captive bred 30 endangered species 30 Mammoths 30 common ancestor 30 endangered 29 fossilized 29 Sage grouse 29 Endangered Species List 29 extinctions 28 penguin species 28 nesting pairs 28 rarest