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Within the page text, I think that it is somewhat a judgement call. You should not repeat keywords over and over, and the search engines will see bird, bird bath, bird feeder, etc., as keyword stuffing. Try to spread it out.
Each engine likes their own formatting of the title, metas and such so research a few and see which ones may bennifit you the most. You can win with all engines unless you cloak. and i dont know if cloaking is the perfect solution. I like changing my content all the time, the tags and all.