Immortality might seem like a fairy tale, but some species are renowned for cheating death, and one marine animal has recently been discovered to de-age itself.

For sea walnuts, this is a bit harder. Mnemiopsis leidyi, also known as sea walnuts, comb jellies or ctenophores, are a type ...

A 520-million-year-old fossil resembling a flower is the great ancestor of modern-day comb jellies, jellyfish-like sea creatures that cast a rainbow-like effect as they propel their way through ocean ...

They were a pair of ctenophores, or comb jellies (Mnemiopsis leidyi), which have gelatinous bodies and closely resemble jellyfish. The scientists found that the comb jellies, a.k.a. sea walnuts ...

The biologist had just come from the first floor, where tanks held a colony of gelatinous comb jellies. The blob was bigger than others, and it looked as though two of the jellies had merged into one.

The biologist had just come from the first floor, where tanks held a colony of gelatinous comb jellies. The blob was bigger than others, and it looked as though two of the jellies had merged into one.