Related to the jellyfish and corals, Siphonophore is a continuous chain of specialized polyps - individual animals that grow from one another in an organized colony. Some in the colony are devoted to feeding, armed with stinging cells to snag fish or in
Swim in Jellyfish Lake in Palau. The lake was originally part of the ocean, but it was closed off and, over time, the jellyfish have lost the power to sting. Of course, it was closed to the public the one time I was in Palau.