Jellyfish Rule! The Nature of Things : Season 54 Episode 32

Jellyfish, also known as jellies, are one of the oldest yet simplest creatures on Earth, they having no brain, no blood, no spine, no heart, no eyes and no ears. They are also one of the most efficient creatures, everything they do which contributes to their survival and thus longevity as a species. Most contain venom which through their tentacles can sting, and in several cases even kill humans. Blooms of jellies seem to be taking over many of the coastal salt water regions of the world, which concerns many scientists. Already efficient creatures, jellies seem to be ...