The Hippocampus is a glamourous animal of the ocean. They were the pets of the sea and horse god, Poseidon and would draw his chariot across the sea. They have the upper-half of a horse and the lower-half of a fish or dolphin. They love being out at sea and are fairly strong creatures with lots of stamina. They are devotional to their god and like to spend time with their fellow Hippocampi.
The Hydra, an ancient serpent-like chthonic water beast that possessed many heads , the poets mention more heads than the vase-painters could paint, and for each head cut off it grew two more, it's poisonous breath and blood were so potent, even its tracks were deadly. The Hydra of Lerna was killed by Hercules as the second of his Twelve Tasks