A man has warned others after stumbling upon a "dangerous" sea creature that can be fatal to humans.
Karl Lee, 47, spotted the "strange" looking sea animal while walking along Ainsdale beach in Merseyside with his wife.
The creature Karl and his wife came across is known as a Portuguese Man o'War, reports the Liverpool Echo.
Karl said: "[It was] very strange. At first I thought it was a balloon until I had a closer look and identified it using an app and realised what it was and how dangerous they are and looked up that they have been washing up along the coast from Cornwall to Cumbria."
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The blue bottle jellyfish can have tentacles as long as 100 ft while it's capable of killing a human - although this rarely happens.
Its tentacles can deliver a painful sting powerful enough to kill fish and sometimes even humans.
They are often driven to beaches and bays by strong winds.
Finding one often means there are many others in its vicinity.
People who find the Portuguese Man o'War should be extremely careful as they can still deliver a sting after being washed ashore - this has previously resulted in some beaches closing after one has been discovered.
Symptoms of a sting can include severe pain, whip-like red welts on the skin that normally last two or three days.
The pain should usually subside after one to three hours.
The venom from the jellyfish can travel to the lymph nodes which may mimic an allergic reaction that can result in fever, shock and in extreme cases, death but this is very rare.
Karl took to Facebook to warn people walking their dogs on the beach.
In the post, he said: "Watch out on Ainsdale beach with your dogs found a Portuguese Man of war."
