Related by context. Frequent words. (Click for all words.) 69 flyway 66 migratory routes 62 Pacific Flyway 60 migratory route 58 Migratory birds 58 migratory birds 56 migrating waterfowl 55 migrating birds 54 wintering grounds 53 avian species 52 migratory waterfowl 52 nesting grounds 51 pintails 51 river deltas 51 waterbirds 50 migratory bird 50 migratory species 50 calving grounds 49 bird species 49 shorebirds 49 landmasses 49 avian influenza viruses 48 canvasbacks 48 migratory 48 waterfowl 48 rookeries 48 Whooping cranes 48 nesting habitat 47 birds 47 wild fowl 47 species 47 scaup 47 flycatchers 46 thrushes 46 breeding grounds 46 sandpipers 46 ptarmigan 46 transects 46 snowy owls 46 mergansers 45 tundra swans 45 Peregrine falcons 45 mallards 45 sandhill crane 45 breeding colonies 45 cormorants 45 H#N# subtype 45 songbirds 45 cottontails 45 coasts 45 pronghorns 44 grebes 44 sandhill cranes 44 eagle nests 44 migratory patterns 44 mountain ranges 44 Bald eagles 44 deer herds 44 wildfowl 44 northward migration 44 grassland birds 44 habitats 44 shorebird 43 curlew 43 tree swallows 43 egrets 43 trumpeter swans 43 routes 43 green winged teal 43 wintering 43 coastlines 43 Alternate routes 43 mourning dove 43 flocks 43 National Wildlife Refuges 43 rivers 42 geese ducks 42 killdeer 42 blue winged teal 42 corridor 42 barn swallows 42 tidal flats 42 river valleys 42 habitat 42 black footed ferret 42 wading birds 42 salmon spawning 42 damselflies 42 wild turkeys 42 Important Bird 42 mammals 42 Canada geese 42 sharp tailed grouse 41 bald eagles 41 freshwater ecosystems 41 tailed deer 41 roosts 41 oystercatchers 41 avian virus 41 sedimentary basins 41 pintail