Nudibranchs that feed on certain sponges, for example, become toxic to predators when they concentrate the sponges’ toxins in their own bodies. Nudibranchs adapted to feed on hydrozoans—like the ...

In this guide, we’ll explain the OKR framework and when OKRs should be used. We’ll also provide several examples of objectives and key results so that you can better understand how to ...

They’re hydrozoans — a species related to jellyfish, anemones and corals, the park service said. The invertebrate, oval-shaped creatures typically measure 3 to 4 inches long, and have ...

Known by the nickname of by-the-wind sailors, velella velella are hydrozoans — a species related to jellyfish, anemones and corals, according to the U.S. National Park Service. The oval-shaped ...