Fish make cocoons to sleep safely

BBC: "The bullethead parrotfish (Chlorurus sordidus) takes about 45 to 60 minutes to produce its cocoon," explained Dr Gutter. The mucus-producing glands behind their gills are about the size of a 10 pence piece; large organs for a fish that grows to a maximum length of 40cm. To find out if the sleeping cocoons had a protective role, the researchers conducted an overnight experiment. They exposed coral reef parrotfish with and without cocoons to skin parasites called gnathiids. Fish without......

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