Clouds drift by like cotton balls so white.
Meaning: The clouds move slowly and smoothly past the bird, looking like soft, fluffy white cotton balls.
Choice of Words: Clouds are visible masses of tiny water droplets or ice crystals suspended in the atmosphere, drift means to move slowly and smoothly in a particular direction, by means past or near something, cotton balls are soft, fluffy balls of cotton, and so white means very white.
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