I would liken Eagles to angels. They fly, they are beautiful, powerful and majestic; sent to Middle-Earth as the agents of Manwe. (Actually, if anyone has noticed, 'eagle' is in fact a similar phonetic enunciation to 'angel'. The two words are related in they way they are said.)
Since eagles do fly, and since they are powerful and majestic -- surely we all admire them (well obviously I do myself...) -- they are effective in this role. The manifestation of divine assistance and power, if you like.
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