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For both sexes, excluding the male's tusk, the total body size can range from 3.95 to 5.5 m (13.0 to 18.0 ft); the males are slightly larger than the females. The average weight of an adult narwhal is 800 to 1,600 kg (1,800 to 3,500 lb).
Narwhals live in groups of 10-100 individuals though can sometimes form much larger groups. The most obvious and striking feature of narwhals is the tusk. This is an elongated canine tooth and is mainly found in males though around 15% of females also have a tusk albeit shorter and with a less pronounced spiral.