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National Unicorn Day is really here!

9 April is National Unicorn Day. But why is everyone so obsessed with unicorns, and what myths do we know about them?
9 April is National Unicorn day. It's a chance for fans of the mythical creatures to celebrate by making rainbow cupcakes and decorating them with lots of sprinkles and glitter. Stories of unicorns have been around for thousands of years. Here's what we know about these mysterious creatures.
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What’s four metres long, 2.5 metres high, weighs 3.5 tonnes and has a very big horn in the middle of its face? A really massive Siberian unicorn, that’s what. Researchers at the Natural History Museum say 'Siberian unicorns' were around before the Ice Age and lived at the same time as early humans around 35,000 years ago. As you can see it wasn't all rainbows and sparkles for this unicorn; the species is an ancestor of the modern-day rhinoceros, but was much bigger and heavier.
An-artist-impression-of-Siberian-unicorn.NATURE ECOLOGY AND EVOLUTION
This is the classic image of a unicorn. It's not as big or hairy as the Siberian unicorn - but have you ever wondered why the animals are so popular? Chances are, you've probably seen someone with a unicorn related item like a bag, jumper, or fancy-dress costume, or perhaps you're a big fan of the mystical creatures yourself!
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The mythological creatures are like horses, but the main difference is that they have a single curled horn. This picture was taken at a winter solstice ceremony at Stonehenge in Wiltshire. The woman wearing the unicorn mask said she thought the imaginary creatures were beautiful.
Unicorn-head-mask-woman-Stonehenge.Getty Images
No-one knows where the idea of unicorns came from. Many people in the Middle Ages really believed that unicorn horns could heal sickness. However, many of the horns that were shown off as unicorn horns actually came from other creatures, like rhinos and also these animals - narwahls. These strange mammals look like unicorn whales! Narwahls are also known as the unicorns of the sea.
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Is this a picture of the Forbidden Forest? Unicorns were really important to one famous baddie - can you remember who? Lord Voldemort of course! In Harry Potter and the Philosopher's Stone, He Who Cannot Be Named needs to drink unicorn blood to stay alive. In the world of Harry Potter, killing a unicorn is seen as a terrible crime.
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Unicorn outfits are great for dressing-up parties and make pretty cool costumes. This chap is called Parker, and his owners gave him this unicorn horn for a Halloween Parade in the town of Sacramento in California. It's very cutesy, but not that spooky considering it's for Halloween!
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Meet ballet star Rainer Krenstetter! He dressed up as a unicorn during the Lifeball at City Hall in Vienna, Austria. Unicorns are often shown as pure white, but in stories they can be any colour - from jet-black and brown to dazzling gold, brilliant red or pink.
Unicorn-ballet.Getty Images