Little rainworms are joyfully playing on the shore of the water tank, the little frogs and little fishes are also playing. Little fish suddenly starts to suffocate, sludge and dirt leak from the tube. Little rainworms try to help little fish quickly, they turn into an oxygen device and a bath with clean water. Little rainworms clog the source of pollution in vain, a loose spade catapulting Blackbird. He recovers and gets an idea with the use of a sieve, little rainworms join him and with the help of sieves filter polluted water.
||Zuzana Bukovinská, Martin Procházka
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