What Were the Largest Ever Dinosaurs?

When it comes to the world of dinosaurs, size truly matters. These prehistoric giants have fascinated scientists and enthusiasts alike for centuries, sparking debates about which species holds the title of the largest dinosaur that ever lived. This article aims to shed light on this intriguing topic, exploring the contenders for the biggest dinosaur ever discovered.

The Contenders

Several species vie for the title of the largest dinosaur ever. The most notable among them are Argentinosaurus, Bruhathkayosaurus, and Patagotitan.


Argentinosaurus is often considered one of the heaviest dinosaurs ever. This enormous sauropod roamed what is now Argentina approximately 90 million years ago. Although exact measurements are challenging due to incomplete fossil records, estimates suggest that Argentinosaurus could reach lengths of up to 35 meters (115 feet) and weighed as much as 100 tons.


Bruhathkayosaurus, a dinosaur from India, is another strong contender in the race for the largest dinosaur ever found. While its remains are fragmentary, some paleontologists speculate that it might have been even larger than Argentinosaurus, potentially reaching lengths of up to 40 meters (131 feet).


Patagotitan, another titan from Argentina, is believed to be one of the longest dinosaurs ever. It’s estimated to have reached lengths of up to 37 meters (121 feet), rivaling both Argentinosaurus and Bruhathkayosaurus in size.

What Makes a Dinosaur Big?

The size of dinosaurs varied greatly, with the smallest species measuring only about the size of a chicken. But what factors contributed to the colossal size of the largest dinosaur ever to walk the earth? The answer lies in their unique biology and environment.

Dinosaurs were part of a group known as archosaurs, which also includes modern-day birds and crocodiles. They had a distinct advantage over other creatures of their time: they were capable of sustained rapid growth. This characteristic, combined with plentiful food sources and few predators, allowed some dinosaur species to grow to incredible sizes.

How Do We Measure Size?

When discussing the biggest dinosaur ever, it’s important to clarify what we mean by “biggest”. Are we referring to length, height, weight, or volume? Each metric could produce a different contender for the title of the biggest dinosaur in the world.

For instance, if we’re considering length, then sauropods like Argentinosaurus, Bruhathkayosaurus, and Patagotitan are likely candidates. However, if we’re looking at height, the tallest dinosaur might be Sauroposeidon, which stood an impressive 18 meters (59 feet) tall.


While it’s difficult to definitively name the largest dinosaur that ever lived due to incomplete fossil records, there’s no denying the sheer scale of these prehistoric giants. Whether it was Argentinosaurus, Bruhathkayosaurus, or Patagotitan, these dinosaurs represent the extreme limits of life’s possibilities on Earth, reminding us of our planet’s extraordinary natural history.

So, what’s the biggest dinosaur ever? Well, it’s a title that may be contested for years to come as new discoveries are made. But one thing is certain: these magnificent creatures continue to captivate our imaginations with their awe-inspiring size and power.


[1] “The biggest of the big.” (2017). Science Magazine. Retrieved from www.sciencemag.org
[2] “Titanosaur: The largest dinosaur ever?” (2016). BBC News. Retrieved from www.bbc.co.uk
[3] “How did dinosaurs grow so big?” (2018). Smithsonian Magazine. Retrieved from www.smithsonianmag.com

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