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The Narwhal (Monodon monoceros) is an Arctic species of cetacean. It is a creature rarely found south of latitude 70°N. It is one of two species of white whale in the Monodontidae family (the other is the beluga whale). It is possibly also related to the Irrawaddy dolphin. The English name narwhal is derived from the Dutch name narwal which in turn comes from the Danish narhval which is based on the Old Norse word nar, meaning "corpse." This is a reference to the animal's colour. The narwhal is also commonly known as the Moon Whale. In some parts of the world, the Narwhal is colloq...

This small desert antelope has a flexible snout, or proboscis, lined with numerous blood vessels that serves as a heat exchanger. Cooled blood then passes directly to the brain, protecting this vital organ from increased body temperature in the heat of the day. The dikdik may be active by day or night and is usually about when the moon is full. It eats shoots and leaves of shrubs and succulents. Family groups, consisting of an adult pair and their young, live in well-defined territories that they protect from neighboring families. Dung, urine, and secretions from facial glands ...