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A "cormorant" is a type of diving seabird.

When birds get ready to sleep for the night they usually find a place to perch. This is called a "roost" and the act of going to this perch is called "roosting".

So the sentence "The cormorants roosted on a tall rock" means that the Cormorant seabirds went to a tall rock to sleep for the night.

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10y ago

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