From their common skeleton, each extends a fringe of tentacles 

that's equipped with stinging cells to paralyze prey. They're 

poised to snatch the animal plankton that swims or drifts within 

reach. Despite a willowy appearance, each species has lightweight 

strength; When ready to feed, it picks a position that's swept by 

suitable currents. Sometimes it mounts another life form, for 

better access to the prey streaming by. 

paralyze.... position....