Related by context. Frequent words. (Click for all words.) 56 polar bears 51 marine ecosystems 49 breeding pairs 49 species 49 Arctic Ocean 48 glaciers 48 polar bear 48 grizzly bears 47 Arctic 47 lynx 46 bull trout 46 grizzlies 46 ecosystems 45 Antarctic Peninsula 45 Beaufort Sea 45 freshwater 45 endangered species 45 overfished 45 overfishing 44 whales 44 Endangered Species Act 44 Polar bears 44 habitat 44 caribou 44 marine ecosystem 44 Marine Mammal Protection 44 mammals 43 sea otters 43 marine mammals 43 bird species 43 oceans 43 wild salmon 43 walrus 43 ocean acidification 43 cormorants 42 Chukchi Sea 42 extinctions 42 habitats 42 coral reefs 42 populations 42 gray wolves 42 walruses 42 wolves 42 fisheries 42 spotted owl 41 salmon 41 atmospheric carbon dioxide 41 bluefin 41 boreal forest 41 commercial whaling 41 polar regions 40 fishery 40 groundfish 40 white tailed deer 40 biodiversity 40 wildlife 40 USFWS 40 moose 40 bluefin tuna 40 river basins 39 sockeye 39 cod 39 gray whales 39 NOAA Fisheries 39 bald eagles 39 Biological Diversity 39 reefs 39 orcas 39 deer herd 39 marine mammal 39 Himalayan glaciers 39 manatees 39 melting glaciers 39 subspecies 39 Antarctica 38 mule deer 38 brook trout 38 corals 38 Antarctic 38 gray wolf 38 chinook salmon 38 humpbacks 38 National Marine Fisheries 38 Antarctic ice 38 continental shelf 38 mammal 38 seabirds 38 grizzly bear 38 Populations 38 Greenland ice 38 NMFS 38 sage grouse 38 biosphere 38 polar ice 37 killer whales 37 biologists 37 bycatch 37 fin whales 37 Chukchi 37 critically endangered 37 migratory bird