Related by context. Frequent words. (Click for all words.) 68 habitat degradation 64 habitat 60 habitats 60 grassland birds 59 predation 59 nesting habitat 59 aquatic habitats 56 ecosystems 56 overgrazing 55 species extinctions 55 species 55 wildlife habitat 55 amphibian populations 55 overhunting 55 biodiversity 54 overfishing pollution 53 terrestrial ecosystems 53 wildlife habitats 53 forest ecosystems 52 ecologies 52 overexploitation 52 ungulates 52 wetland habitats 52 riparian habitat 52 caribou herds 52 ecological degradation 52 ecological 52 aquatic ecosystems 52 wetland habitat 51 aquatic ecosystem 51 urbanization 51 lynx habitat 51 marbled murrelet 51 extinctions 51 conserve biodiversity 50 aquatic habitat 50 keystone species 50 caribou herd 50 avian species 50 transboundary 50 snowshoe hares 50 livestock grazing 50 biota 49 Yellowstone ecosystem 49 insect populations 49 amphibian species 49 waterbirds 49 seagrasses 49 freshwater ecosystems 49 spawning habitat 49 whitebark pine 49 bee populations 49 sage grouse habitat 49 forbs 49 prolonged droughts 49 thawing permafrost 49 seagrass beds 48 overpopulation 48 populations 48 pronghorn 48 woodland caribou 48 red cockaded woodpecker 48 coastal ecosystems 48 bio diversity 48 overharvesting 48 deer herds 48 anthropogenic 48 owl habitat 48 soil erosion 48 migratory routes 48 genetic diversity 47 grasslands 47 melting permafrost 47 habitat designations 47 Florida panthers 47 speciation 47 environmental degradation 47 drylands 47 wildlife 47 pronghorns 47 elephant poaching 47 pollinating insects 47 aquatic species 47 amphibians 47 Urbanization 47 wetlands 47 Overpopulation 47 sedimentation 47 vegetation 47 Sage grouse 47 mammals 47 migratory patterns 47 nutrient runoff 47 retreating glaciers 47 Invasive species 47 spotted owls 46 greater sage grouse 46 biodiversity conservation 46 megafauna 46 watersheds 46 oak woodlands