The Largest Dinosaur Ever Discovered

Determining the "largest" dinosaur is complex, as it can refer to length, height, or weight, and often relies on incomplete fossil records. However, based on current fossil evidence, the most massive and potentially longest dinosaur known is Patagotitan mayorum.

Here's a breakdown by different metrics:

• Heaviest/Most Massive: The undisputed champion by weight is generally considered to be Patagotitan mayorum. Discovered in Argentina, this long-necked sauropod is estimated to have weighed between 55 and 70 metric tons (121,000-154,000 pounds), making it heavier than a Boeing 737. Another strong contender is Argentinosaurus huinculensis, with similar weight estimates, though Patagotitan has a more complete fossil record.
• Longest: While Patagotitan was incredibly long (around 37 meters or 121 feet), some fragmentary remains suggest others might have been even longer. Supersaurus vivianae, another sauropod, is estimated to have reached lengths of up to 39-42 meters (128-138 feet), making it a strong candidate for the longest.
• Tallest: The tallest dinosaur was likely Sauroposeidon proteles. With an incredibly long neck, it's estimated to have stood up to 17 meters (56 feet) tall, equivalent to a six-story building.

Pro tip: The field of paleontology is constantly evolving. New discoveries and re-evaluations of existing fossils can change our understanding of dinosaur size, so the "largest" title is always subject to change!