The hydra is underwater in Posidons temple/house. Once you get inside the house there is a big "pool". You can go to the one area and there is an opening. The hydras at the end of a maze underwater.
The Hydra is in his underwater lair. Swim out from the beach to the underwater maze, then go right, down, and left to find the Giant Pearl and the entrance to the Hydra cave.
the hydra is in a underground cave near Poseidon's statue.
in the underground cavern near Poseidon's statue
To complete Mythology Island on Poptropica, you need to follow the quest given by Zeus to find five legendary items. These items are the Thread of Ariadne, Ring from Minotaur, Hydra's Scale, Golden Apple, and the Mirror of Medusa. By locating and retrieving these objects from different parts of the island, you can return them to Zeus and successfully complete the island quest.
You find it in a tree that's all I know.
you can't
You have to wait until the hydra tries to bite you. You have to jump on the head to knock it out. Once all of the heads are knocked out, you swim below and you will find the scale.
Go to Aphrodite's place and talk to the life guard. Dive into a hole near the statue and swim to a cave where you find the hydra. Jump on the hydra's heads to knock it out. After it has been knocked out, click on its body to get the hydra scale.
There is no key when you get Hercules he brakes the lock
The giving table is somewhere on mythology island so find it yourself BOB! Excuse me!!
it is to the left of the sphinx and by the entrance to the bull guys place.
You have to find Hercules and get him to push the rock out of the way.