Now, two new species found around the black smoker chimneys of the Hydra and Falkor hydrothermal vent fields have been ...

But does it require a brain? Animals in the phylum Cnidaria, which includes everything from the tiny hydra to enormous jellyfish, lack a centralized structure that we can recognize as a brain.

Although the result is infinitely less terrifying than the gigantic, many-headed monster of Greek mythology, scientists have succeeded in coaxing the real-life Hydra, a tiny freshwater polyp ...

Hydra — off the east coast of the Peloponnese ... island of equines — there are over 1,000 of them here, all working animals — to offer horse-riding to visitors, in 2014.