Related by context. Frequent words. (Click for all words.) 61 nesting seabirds 60 freshwater marshes 56 delicate ecosystems 56 Sea otters 56 temperate rainforest 55 coastland 55 Migrating birds 54 receding glaciers 54 equatorial waters 54 Beluga whales 53 Tidal waves 53 glaciers melt 53 freshwater habitats 53 migrating whales 53 penguin colonies 53 freshwater marsh 52 seals sea lions 52 melting icecaps 52 migratory bird species 52 Arctic foxes 52 icecaps 52 seagrass meadows 52 seabeds 52 seawaters 52 glaciers 52 temperate forests 52 subarctic 52 petrels 51 species extinctions 51 Antarctic seas 51 gastropods 51 Melting glaciers 51 kelp beds 51 saltwater marshes 51 Sperm whales 51 permafrost thaws 51 Adelie penguins 51 stinging jellyfish 51 intertidal zone 51 Migratory birds 51 phytoplankton blooms 51 Polar Regions 51 river deltas 51 grassy plains 51 Olive Ridley turtles 50 shallow continental shelf 50 deltaic 50 Minke whales 50 oceans 50 Poyang Lake 50 intertidal 50 wetland ecosystems 50 parched landscape 50 inter tidal 50 eiders 50 severe droughts 50 eelgrass beds 50 coniferous forests 50 landmasses 50 grazing pastures 50 migratory songbirds 50 Volcano erupts 50 densely inhabited 50 fragile ecology 50 biodiversity hotspot 49 sparse vegetation 49 tidal basin 49 sargassum 49 Whale sharks 49 mangrove islands 49 Equatorial Pacific 49 beluga whales 49 migratory shorebirds 49 reef ecosystems 49 murres 49 Bottlenose dolphins 49 navigable rivers 49 lowlands 49 driest inhabited continent 49 mudflat 49 glacial melt 49 fiords 49 ecologically fragile 49 rookeries 49 nesting habitats 49 peat swamps 49 subtropical regions 49 conifer forests 49 retreating glaciers 49 archipelagic nation 49 escarpments 49 wintering birds 49 deciduous forests 49 lowland forests 49 extinct volcanoes 49 tidal wetlands 49 Invasive plants 49 prolonged droughts 49 streambanks 49 volcanic peaks 49 refugia