text: How long is a giant Siphonophore? - Whatswhyhow
  Cool Facts This siphonophore can grow to lengths of 130 feet (40 m), longer than the blue whale, which is usually considered Earth's largest animal. But the siphonophore's body is not much bigger around than a broomstick.
  Regarding this, what do giant Siphonophores eat?
  what does a Siphonophore look like? The majority of siphonophores are long and thin, consisting mostly of a clear gelatinous material. Some deep water species have dark orange or red digestive systems that can be seen inside their transparent tissues. All siphonophores are predators, and use their many tentacles to capture crustaceans and small fish.
  Beside above, are Siphonophores dangerous?
  You're probably better acquainted, though, with a much more dangerous species of siphonophore: the Portuguese man o' war (technically, they are not true jellyfish, but I'm not about to be the one to break it to them).