Related by context. Frequent words. (Click for all words.) 57 species 56 critically endangered species 55 habitats 55 freshwater turtles 55 horned rhinos 55 keystone species 55 Sumatran tigers 54 critically endangered 54 Yellowstone ecosystem 53 apex predators 53 endangered 53 endangered species 53 Florida panthers 53 megafauna 52 overhunting 52 endangered primates 52 rookeries 52 black footed ferrets 52 biodiversity hotspots 52 caribou herd 52 avian species 51 amphibian species 51 habitat 51 vertebrate species 51 sagebrush habitat 51 Critically Endangered 51 frog species 51 Amur tigers 51 beluga sturgeon 51 Galapagos islands 51 California condors 50 monk seals 50 breeding colony 50 endangered mammals 50 amphibian populations 50 bird species 50 elephant herds 50 breeding pairs 50 clouded leopards 49 pronghorns 49 ecosystems 49 majestic creatures 49 biodiversity hotspot 49 Sandhill cranes 49 Asiatic lions 49 genetic diversity 49 Whooping cranes 49 breeding colonies 49 pikas 49 leatherback turtles 49 marbled murrelet 49 burrowing owl 49 petrels 49 genetically distinct 49 ibises 49 Javan rhino 49 genetically pure 49 snowy plover 49 mountain caribou 49 subspecies 49 woodland caribou 48 red legged frogs 48 black footed ferret 48 tortoises 48 mussel species 48 Florida panther 48 Cook Inlet belugas 48 freshwater ecosystems 48 western lowland gorillas 48 waterbirds 48 grassland birds 48 extinct 48 captive breeding 48 Mexican spotted owl 48 cassowary 48 orangutans 48 grassland habitat 48 orchid species 48 Sumatran rhinos 48 federally endangered 48 musk oxen 48 nesting pairs 48 wintering grounds 47 amphibians 47 yellow legged frog 47 temperate forests 47 lowland forests 47 wading birds 47 wood stork 47 Steller sea lions 47 calving grounds 47 populations 47 giant tortoises 47 carnivores 47 timber rattlesnake 47 mountain gorillas 47 saola 47 sloth bears 47 greater sage grouse 47 rhinoceroses 47 Feral cats