Many fish swim and feed during the day and hide in the reef at night. Parrotfish cover themselves with a kind of mucus sleeping bag when they retire for the evening. The bag seals in their smell so hunting eels can't find them.

The bag is mainly for .

A - protection

B - comfort

C - hunting

D - warmth

A. Protection

Explanation:

There are many possible explanations for the cocoons: they’re an early warning system; they act as a dust sheet; they protect the fish from DNA damage caused by sunlight; the list goes on. The most popular theory is that the cocoons protect the fish from predators. It dates back to 1959 when Howard Winn and John Bardach found that three species of mucus-weavers are less often eaten by moray eels than a fourth species that sleeps uncovered. But the duo never considered other differences between the four species and they still found that the eel occasionally ate the allegedly protected individuals. To date, the idea has never been properly tested.

a dictionary is the correct answer

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