Brainstorm Some Keywords

No matter where you're searching, you will need to pick out the most important keywords. These are generally nouns.

How does the pollution of rivers affect the population of migratory waterfowl?

Other related words for river and waterfowl might be:

river: waterway, stream, streams, conduit, watercourse, tributary
 
waterfowl: ducks, geese, goose, cranes, gulls, birds

Note that we've included variations of keywords such as plurals. Include any alternate spellings of words or abbreviations, too.

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