Marine animals can be fascinating and quite beautiful. However, you should not approach some of them. Certain fish and jellyfish are highly poisonous, and contact with them can sometimes be fatal.

Diver John Roney shared mesmerizing video footage from his last dive — a close-up of the world's largest lion's mane jellyfish.

We’ve all heard of deadly snake bites and scorpion stings, but while the animal kingdom is brimming with venomous critters, it’s quite unusual to come across species that can kill from a distance.

An unprecedented number of "pink meanie" jellyfish, a species that can grow up to 50 pounds with tentacles stretching as long as 70 feet, are washing ashore along the Texas coast. From Port Aransas to ...

Multiple massive, rare jellyfish washed up on the Texas coast recently, surprising some beachgoers and feasting on a smaller jellyfish species. Jace Tunnell, the director of community engagement at ...

These cube-shaped marine creatures, inhabiting the Indo-Pacific region, come in approximately 50 species. Box jellyfish range in size from the tiny Irukandji group of jellyfish, that are the ...

At Delaware's Lewes Beach, Beach Patrol Captain Strohm Edwards has seen more jellyfish this year than any other and stings have tripled. Along the Nantucket Sound shoreline, researchers believe ...