Portaferry Coastguard Rescue Team on Strangfrod Lough in Northern Ireland has warned of hundreds of Lion's Mane jellyfish washed up on the shore at Cloughey on the eastern coast of the Ards Peninsula. It's a small village with a beautiful sandy beach.
The team warned that anyone finding a Lion's Mane jellyfish should be aware that the tentacles of this species retain their potent sting long after the jellyfish has died, and dead specimens should therefore never be touched under any circumstances; and that if a dog comes into contact with a Lion's Mane Jellyfish, immediate veterinary attention is advised as anaphylactic reactions are not uncommon.
This jellyfish uses its stinging tentacles to capture, pull in, and eat prey such as fish, zooplankton, sea creatures, and smaller jellyfish and the largest recorded was measured found of the coast of Massachusetts in 1865 and had a bell 7 feet diameter and tentacles around about 120 feet long.