
Appearance
They are not poisonous and are quite large, especially the females. It has been introduced in some countries where it was not native, one of which is Malta. First kept as a pet, then recently during the 1990s, it was deliberately introduced to a number of fresh water rock pools in Gozo, where in one it sustains a large population. Though a prolific and invasive species, it is restricted to constant fresh water supply, so it cannot spread naturally on its own on arid Mediterranean islands.References:
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