While swarm of jellies may look serene, you're best off keeping your distance. A sting from the most dangerous jellyfish on Earth can be deadly. Even when we're not looking at the most dangerous, many ...

Fused Warty Comb jellyfish (Mnemiopsis leidyi ... creating a "disappearing anus" — yet this is the first evidence for two separate jellies becoming one. But If these two individuals are ...