Related by context. Frequent words. (Click for all words.) 66 biodiversity hotspot 64 deciduous forests 61 biodiversity hotspots 60 wetland ecosystems 60 lowland forests 60 aquatic habitats 59 terrestrial ecosystems 58 species 58 temperate forests 58 grassland birds 57 evergreen forests 57 grassland habitat 57 wetland habitats 57 habitat 57 biologically diverse 56 federally endangered 56 aquatic ecosystem 56 biodiverse 56 biota 56 avian species 56 biome 56 habitats 56 headwater 56 boreal 55 federally endangered species 55 watersheds 55 marbled murrelets 55 ecosystems 55 Amazonian rainforest 55 Important Bird 55 faunal 54 forested wetlands 54 biosphere reserve 54 forest ecosystems 54 freshwater ecosystems 54 invertebrate species 54 Atlantic Flyway 54 amphibian populations 54 amphibian species 54 deciduous forest 54 intertidal 54 geomorphology 53 hardwood forests 53 mammal species 53 Biosphere Reserve 53 vertebrate species 53 Boreal forest 53 tidal marshes 53 headwater streams 53 landforms 52 National Wildlife Refuges 52 freshwater wetlands 52 Habitat Restoration 52 keystone species 52 mussel species 52 aquatic invertebrates 52 nesting habitat 52 Bighorn Basin 52 wintering birds 52 riparian habitat 52 systematics 52 Coastal Plain 52 Birding Trail 52 woodland caribou 52 damselfly 52 habitat fragmentation 51 subspecies 51 flora fauna 51 biomes 51 bird species 51 landform 51 river deltas 51 Cerrado 51 coniferous trees 51 Polar Regions 51 boreal forests 51 greater sage grouse 51 seagrasses 51 marine sediments 51 biodiversity 51 red cockaded woodpecker 51 river basins 50 oak woodlands 50 flora 50 pine marten 50 river valleys 50 biogeography 50 Trans Pecos 50 Yellowstone ecosystem 50 coral species 50 caribou herds 50 taxa 50 Dry Valleys 50 seals sea lions 50 sagebrush habitat 50 Whooping Crane 50 aquatic ecosystems 50 nesting bald eagles 50 eelgrass beds 50 tidal wetlands 50 Late Cretaceous