Jellyfish, often found washed ashore or trapped between rocks, are a good example. Even if they appear harmless, these special sea creatures will surprise you with how quickly they sting — even ...

have observed for the first time the birth of transmissible tumors in freshwater brown hydras—tiny, jellyfish-like creatures. Brown hydras are microscopic organisms found in ponds, rivers and ...

Jellyfish are known for drifting to and fro at the whim of ocean currents—but not all species are so passive. The millions of golden jellyfish that pack Palau’s Jellyfish Lake spend much of ...