Water flea

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The water flea is a superorder of tiny, mostly freshwater crustaceans, most of which feed on microscopic chunks of organic matter, though some forms are predatory..

It's the water flea | that the shadow stole from you | and now you are sick | and the autumn fly | that you crushed | he will not forgive you. | On the water of the stream perhaps you | you bent down too much, | you call your shadow, but | she will not return. (Angelo Branduardi)
It's the water flea | that the shadow stole from you | and now you are sick | and the green snake | that you crushed | he will not forgive you. | And then you have to sing for a long time | to make you forgive me | and the water flea, who knows | the shadow will make you. (Angelo Branduardi)