The riddle's answer is a fish, matching the characteristics provided in the riddle.
The answer to the riddle 'I have scales but don't weigh. I am never thirsty but always drinking. I sleep with my eyes open' is a fish.
The characteristics described in the riddle match those of a fish, as fish have scales, extract oxygen from water, and do not close their eyes while sleeping.
It is essential to read riddles carefully and think creatively to decipher the intended answer.
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