Other jellies have no mouth. Alternatively, they ingest food via openings on their oral arms, the American Museum of Natural History reports. Jellyfish digest their meals very quickly.

Jellyfish could be much smarter than scientists previously thought, asserts a new study published in the journal Current Biology. Poisonous Caribbean box jellyfish can learn at a far more complex ...

Tripedalia cystophora, a box jellyfish from the Caribbean. The black dots embedded low on the bell are the animal’s visual sensory and learning center, called rhopalia.