What are the strange transparent ‘jelly bean’ creatures invading Spanish beaches?

What are the strange transparent ‘jelly bean’ creatures invading Spanish beaches?

They might be odd, but they're completely harmless.

Strange blue sea creatures wash up on Costa Blanca beaches

Strange blue sea creatures wash up on Costa Blanca beaches

Authorities scoop ELEVEN tonnes of jellyfish from Costa del Sol beaches

Authorities scoop ELEVEN tonnes of jellyfish from Costa del Sol beaches

Portuguese man o’war stingers close down Costa Blanca and Mallorca beaches

Portuguese man o’war stingers close down Costa Blanca and Mallorca beaches

Barcelona beaches invaded by swarms of strange blue sea creatures

Barcelona beaches invaded by swarms of strange blue sea creatures

Experts warn of jellyfish boom across Spain’s beaches

Experts warn of jellyfish boom across Spain’s beaches

British woman braves jellyfish for Balearic swim challenge

British woman braves jellyfish for Balearic swim challenge

Barcelona beaches reopened after shark alert

Barcelona beaches reopened after shark alert

Jellyfish plague stings Spain’s beachgoers

Jellyfish plague stings Spain’s beachgoers