Related by context. Frequent words. (Click for all words.) 60 predators 59 habitat fragmentation 59 habitat degradation 55 parasitism 55 depredation 55 overhunting 54 snowshoe hares 52 habitat 50 foraging 50 ungulates 49 nesting habitat 49 inbreeding 49 cowbirds 49 overgrazing 49 habituation 49 species 49 insect populations 48 overharvesting 48 extirpation 48 forage 47 predator 47 overexploitation 47 trophic 47 crocodilians 47 petrels 47 overfishing pollution 47 overfishing 47 herbivores 47 populations 47 asexual reproduction 47 Yellowstone ecosystem 46 amphibian populations 46 apex predators 46 stoat 46 extinction 46 Sage grouse 46 speciation 46 interbreeding 46 aquatic habitats 45 salmonids 45 genetic diversity 45 parasites 45 deer herds 45 cormorants 45 grassland birds 45 Steller sea lions 45 mortalities 45 genetic variability 44 predatory 44 nestlings 44 corticosterone 44 winterkill 44 evolutionary adaptation 44 extinctions 44 aquatic insects 44 keystone species 44 grazers 44 predator prey 44 habitats 44 zooplankton 44 nonnative fish 44 desiccation 44 symbionts 44 waterbirds 44 mountain caribou 43 milder winters 43 bycatch 43 species extinctions 43 breeding colonies 43 stoats 43 fecundity 43 sticklebacks 43 prey 43 overpopulation 43 cormorant 43 denning 43 depredations 43 aquatic habitat 43 larval 43 nesting birds 42 barred owl 42 marbled murrelet 42 forbs 42 marine invertebrates 42 avian species 42 mating 42 whirling disease 42 caribou herds 42 carnivores 42 spawning habitat 42 spawners 42 sea lice 42 translocations 42 bee populations 42 pronghorns 41 owl habitat 41 mortality 41 snowshoe hare 41 cannibalism 41 caribou herd 41 wolf packs