Bootlace Worm (Lineus longissimus)
The longest known animal in the world is the Bootlace Worm. Although this creature usually has only a 5-10 mm in width, it can grow enormously as long as 60 meters. It can be found along the coasts of Britain. The longest specimen on record which was measured in Scotland in 1864 had a length of 55 meters.
Lion's Mane Jellyfish (Cyanea capillata)
The second longest living animal on the planet is the Lion's Mane Jellyfish. It is also the largest known species of jellyfish. They inhabit the cold waters of Arctic, Atlantic and Pacific Oceans. The largest specimen on record was found washed up on the shore of Massachusetts Bay in 1870. Its tentacles were 36.5 meters long and its bell (body) had a diameter of 2.3 meters.
Blue Whale (Balaenoptera musculus)
Although the Blue Whale is considered as the largest animal ever known to have existed, it is only the 3rd longest animal in term of length. This enormously huge marine mammal can grow as long as 33.6 meters and can weigh as much as 180 metric tons.
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