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A narwhal is a kind of dolphin whose long tusk has a poro... | funfact.wiki | funfact.wiki
A narwhal is a kind of dolphin whose long tusk has a porous surface that lets seawater reach its nerves. Alternating salty and fresh water on it measurably changes the animal's heart rate, revealing it as a salinity sensor.
  • Narwhal
  • Dolphin
  • horn
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The image of Vikings in horned helmets is a myth—no excavated Viking helmet has horns. It spread from the 1876 premiere of Richard Wagner's opera the Ring cycle, when designer Carl Emil Doepler added horns to the male helmets.
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  • horn
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Juvenile male dolphins engage in same-sex sexual play, including inserting the penis into another male's blowhole. This serves as practice for later mating and forges bonds between males. Males who played more as juveniles later had greater reproductive success.
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