But to capture prey — as some of us find out the hard way — jellyfish have a net of tentacles that contain venomous, stinging ...

She added that while jellyfish populations naturally fluctuate, with some years seeing more than others, the cycles are becoming shorter. She said: "In the Costa Brava, these cycles are now shorter.

A Portuguese man o’ war is actually a siphonophore, which is a collection or colony of individual organisms. Siphonophores are closely related to jellyfish, but they aren’t the same.