These are typically smaller than scyphozoan jellyfish. The polyp stage of their lives is usually more conspicuous than the small adult jellies. However, not all hydrozoans are considered jellyfish.

Jellyfish are known for drifting to and fro at the whim of ocean currents—but not all species are so passive. The millions of golden jellyfish that pack Palau’s Jellyfish Lake spend much of ...

This cute paper bag jellyfish craft for kids is a fun project to learn more about these kids under the sea. Here is how to ...

Humans know of about 245,000 marine species. The most common sea animals are those without a backbone, such as jellyfish and shrimp. There are thousands of species of jellyfish and shrimp.