Colin the Crab, the most skillful builder on the eastern riverbank, never hesitates to help his friends. Now Colin is busy with his own new project-a garden pavilion for his home. But after a week of hard work, the pavilion of his dreams is still unfinished. Even worse, a boisterous fish family has taken over the construction site. The exhausted Colin buries himself under a blanket and refuses to open his curtains. Puzzled, Colin's friends call an emergency meeting-it's time for them to take action

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Krabas Kolinas buvo geriausias statybininkas visoje rytineje pakranteje ir niekada neatsisakydavo padeti draugams. Po visą savaitę trukusių sunkių darbų jo paties issvajotoji melyna pavesine vis dar nebuvo baigta, o statybvieteje apsigyveno isdykelių zuveliokų seimynele.

Pavargęs Kolinas uzsidare savo miegamajame ir atsisake atitraukti uzuolaidas. Sunerimę jo draugai susauke skubų susirinkimą ir nutare imtis neatideliotinų priemonių.