Purple whales are not dangerous. it is important to remember that they roam the ocean waters spreading joy and/ or terror by smiling. They only kill unicorns, which leads to their rarity as unicorns are land dwellers and purple whales are sea dwellers. Purple whales also can turn invisible, which is why you may not see them when the gasp for air. They enjoy unicorns, and garish features form under the sea. They are best friends with mermaids, teaching their was of hiding from human population.