Where do box jellyfish live?
Box jellyfish
A fully grown box jellyfish can measure up to 20cm (7.9in) along each box side (or 30cm (12in) in diameter), and the tentacles can grow up to 3m (9.8ft) in length. Its weight can reach 2kg (4.4lb).[12] There are about 15 tentacles on each corner. Each tentacle has about 500,000 cnidocytes, containing nematocysts, a harpoon-shaped microscopic mechanism that injects venom into the victim.[13] Many different kinds of nematocysts are found in cubozoans.[14]