Transparent Immortal Jellyfish

How does the immortal jellyfish live forever?
The life cycle of most jellyfish species is similar. Museum curator Miranda Lowe explains, 'They have eggs and sperm and these get released to be fertilised, and then from that you get a free-swimming larval form.

'The larva will move about in the current until it finds a hard surface to establish itself. It will then start to mature and grow. Larvae mature into polyps, which will then bud off and mature into young jellyfish.'

An adult jellyfish is known as a medusa. Jellyfish belong to a group called Cnidaria, which also includes sea anemones and corals. As animals, they are subject to the cycle of life and death - though one species is known to bend the rules.