A mass stranding of mauve stingers on the Cornish coast surprises experts.

The relay team suffered so many jellyfish stings they had to be checked out in hospital.

The jellyfish could have been affected by a change in salinity of the seawater after heavy rain.

The velella velella have sail-like structures that propel them across the ocean's surface.

Islanders are asked to be cautious after two separate discoveries of a Portuguese man o' war.

A couple say they were "fascinated" to find an "extremely big" crab on a north Wales beach.

Experts say the creatures would not usually turn up so late in the year.

Hastings Borough Council issue the warning following sightings of the creatures on local beaches.