Final answer:
The narwhal has a dark body and a relatively short tail compared to its body length.
Step-by-step explanation:
The narwhal can be described by the statement: It has a dark body, and its tail is half the length of the body. Narwhals are known for their distinctive features, including a dark body and a long tusk that is actually an elongated tooth. The tail of a narwhal is relatively short, about half the length of its body.
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