Even though they are beautiful, they can be harmful to you.
Recently some weird creatures have been found washed ashore Sydney beaches, including Freshwater beach and Curl Curl beach. They are like a flying dragon in blue colour.
Even they look beautiful and seems touchable, experts warn that they can be as dangerous as bluebottle jellyfish to humans.
Australian Museum's Melissa Murray told the media the sea creature is a part of the blue bottle family.
"They're absolutely beautiful," she said.
The beautiful slugs wash up on Sydney beaches every year, but they will die easily once hitting the shore.
"The glaucus atlanticus normally has tentacles in its system. If another creature tries to eat it they use the tentacles as a defense mechanism," Ms Murray said. "So if you do see one, don't pick it up with your hands. Use a bucket with water instead."
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