Megalodons, meaning "big tooth", are an ancient species of shark that is regarded as one of the largest and most powerful predators in history.
They are the guards of waters of Themyscira.
It's tradition to immerse the right hand in the water. If the megalodon does not eat the person, it can be considered a true Amazon. It's an Amazon mating play. It's not for the weak.
The Amazon Oenone has the skill to communicate with them.
Many of the megalodons are killed while trying to protect Themyscira from the attack of the sea monsters sent by the gargarean Euphemus, Poseidon's son.
Their leader is Swiftmaw, Prince of Devourers.
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