Sydney beaches have been overrun with alien-like dragons which are as harmful as bluebottle jellyfish.

Deemed the blue dragons of the sea, the bizarre creatures look like something from the movies.

Found washed up at Freshwater beach and Curl Curl beach in Sydney’s north, the blue ocean slugs, or glaucus atlanticus, stunned onlookers.

Sydney beaches have been overrun with alien-like dragons (pictured) which are as harmful as bluebottle jellyfish

Deemed the blue dragons of the sea, the bizarre creatures look like something from the movies

Found washed up at Freshwater beach and Curl Curl beach in Sydney’s north, the blue ocean slugs, or glaucus atlanticus, stunned onlookers (pictured)

Although the exquisite creatures look inviting to touch, experts have warned the slugs could give potentially dangerous stings.

Australian Museum’s Melissa Murray told 7 News the interesting sea creatures were part of the blue bottle family.

‘They’re absolutely beautiful,’ she said.

The blue dragon slugs wash up on Sydney beaches every year, but die once they hit the shore.

‘The glaucus atlanticus normally has tentacles in its system. If another creature tries to eat it they use the tentacles as a defence mechanism,’ Ms Murray said.

‘So if you do see one, don’t pick it up with your hands. Use a bucket with water instead.’

Although the exquisite creatures look inviting to touch, experts have warned the slugs could give potentially dangerous stings