How some jellyfish are born (1960)

At a marine biology station, a clump of algae reveals polyps, stomachs with limbs, limbs with buds, buds with poison cells. This animal reproduces by buds, which we watch close up in time-lapse images. In another kind of jellyfish, the buds grow inside then live outside for a few days until being on their own. Another produces eggs, sometimes self-fertilized. Some single eggs become buds with colonies. Another clump gathered at low tide consists of filaments of a colony - plumes with poison ends. In images taking 72 hours, we see filaments grow and produce a feeding organ from which a plume emerges. New jellyfish emerge from buds twice a day at set times to form a new colonies.