Related by context. Frequent words. (Click for all words.) 60 extinct 58 baiji 57 species 57 keystone species 56 biodiversity hotspot 56 critically endangered 56 Critically Endangered 55 biodiversity hotspots 55 vertebrate species 54 endangered 53 genetically distinct 53 Irrawaddy dolphins 53 clouded leopards 53 mammal species 52 Sumatran rhinos 52 endangered primates 51 platypuses 51 apex predators 51 habitat 51 amphibian species 50 avian species 50 critically endangered species 50 overfishing pollution 50 rookeries 49 leatherback turtles 49 toothed whales 49 dugongs 49 Extinct 49 IUCN Red 49 endangered species 49 coral species 49 Galapagos islands 49 giant tortoise 49 mussel species 49 Threatened Species 48 lungfish 48 nearing extinction 48 habitats 48 subspecies 48 Pacific walrus 48 IUCN 48 clouded leopard 48 federally endangered 48 overexploitation 48 biosphere reserve 48 frog species 48 biologically diverse 48 red legged frogs 48 breeding colony 47 overfished 47 penguin species 47 biodiverse 47 Whale sharks 47 extinctions 47 mammal 47 gharials 47 marine turtles 47 yellow legged frog 47 overharvesting 47 beluga sturgeon 47 cassowary 47 marbled murrelet 47 seagrasses 47 basking shark 47 horned rhinos 46 mammals 46 coelacanth 46 breeding colonies 46 frogs toads 46 petrels 46 Javan rhinos 46 Olive Ridley turtles 46 Tasmanian tiger 46 terrestrial ecosystems 46 Cook Inlet belugas 46 leatherbacks 46 waterbirds 46 temperate forests 46 Important Bird 46 BirdLife International 46 lowland forests 46 Ningaloo 45 Sumatran tigers 45 overhunting 45 freshwater turtles 45 Kemp ridley 45 ecological catastrophe 45 phyla 45 species extinctions 45 ecosystems 45 extinction 45 overexploited 45 otters 45 Indohyus 45 leatherback turtle 45 amphibian populations 45 breeding pairs 45 Overfishing 45 extirpated 45 skink 45 Steller sea lions