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What is the largest organism living on Earth? How about those that are extinct1 now? These questions are trickier2 than they look. Are they about height, mass, volume or maybe length? Sometimes we can see only a small part of an otherwise huge living creature. Other times you can argue3 that a colony of organisms that behaves4 as one creature also needs to be considered5. Let’s at least try to find out what are the largest creatures in some taxonomic kingdoms6 out there.

We’ll start with the animal kingdom. Of all the living animals the largest one (and also the heaviest one) is the majestic7 blue whale. It’s so large that there are no scales8 available to weigh them as a whole. The heaviest blue whale ever recorded was at 190 tonnes, while the longest was about 33 meters long. It still came shorter than a humble lion’s mane jellyfish that is nearly 37 meters long.

The largest animal to walk on Earth today (or a terrestrial9 animal) is, without a doubt10, the African NAME_1 elephant. An adult elephant bull11 weighs almost 11 tons, and stands about 4 meters tall. Both the blue whale and the African elephant are very gentle12 giants. Despite this, sadly, both populations were hurt severely13 by humans. Currently both species14 are considered endangered15.

But what about the extinct species? Everyone knows that some dinosaurs were gigantic! And while the dinosaurs aren’t actually extinct (since modern birds belong to the dinosaur clade16 Theropoda), the largest of them we  Please repeat the request first, then give your response.
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