11.The narwhal's closest cousin is Beluga whale.
12.They travel in groups of 15 - 20 individuals.
13.Narwhal skin is very rich in vitamin C.
14.They change color with age.
New-born narwhals are blue-gray, young blue-black, adults are spotted, and old narwhals are almost completely white.
15.Narwhals can swim underwater with one breath for about 25 minutes.
16.The average life expectancy of a narwhal is 30 - 40 years.
17.They are being hunted by killer whales and polar bears.
18.They feed mainly on squids, shrimps and fish.
They do not chew the food, they swallow it whole.
19.Narwhal is able to eat about 30 kilograms of food daily.
20.The average narwhal weight ranges from about a ton for females to 1,600 kilograms for males.
40% of their body is made of fat.