When referring to the "fattest" dinosaur, the term is generally interpreted as the heaviest or most massive dinosaur, given that estimates of adipose tissue in extinct animals are not typically part of paleontological mass calculations. Based on current paleontological estimations, two dinosaurs are contenders for the title of the heaviest: Amphicoelias and Bruhathkayosaurus.
Understanding "Fattest" in Dinosaur Context
For colossal prehistoric animals like dinosaurs, particularly the long-necked sauropods, "fatness" isn't measured in the same way as in modern animals with significant layers of adipose tissue. Instead, paleontologists estimate the overall body mass, which accounts for bone, muscle, organs, and connective tissues. Therefore, the "fattest" dinosaur is understood to be the one with the greatest estimated weight or mass. These estimates are derived from skeletal reconstructions and comparisons with living animals.
The Heaviest Dinosaurs Known
Several sauropods reached truly gargantuan sizes, pushing the limits of terrestrial animal weight. While precise figures can vary among scientific studies, some consistently rank at the top. Here are some of the most massive dinosaurs identified, along with their estimated weights:
| Dinosaur Name | Estimated Weight (Tons) |
|---|---|
| Amphicoelias | 120 |
| Bruhathkayosaurus | 120 |
| Argentinosaurus | 75 |
| Breviparopus | 72 |
| Bustingorrytitan | 70 |
| Puertasaurus | 70 |
| Patagotitan | 68 |
| Alamosaurus | 65 |
Amphicoelias fragillimus
Often considered one of the largest animals to have ever lived on land, Amphicoelias is known from a single, massive fossil vertebra found in the late 19th century. Its immense size suggests an extraordinary weight, estimated to be around 120 tons, placing it among the very heaviest. However, the exact dimensions and weight are subject to debate due to the limited fossil record.
Bruhathkayosaurus matleyi
This sauropod, discovered in India, is another strong contender for the heaviest dinosaur. Based on fragmentary remains, including a tibia and partial pelvic bones, its estimated weight also reaches an astounding 120 tons. Like Amphicoelias, the incomplete nature of its fossils means its exact size is an estimate, but it remains a leading candidate for the most massive terrestrial creature.
Other Notable Giants
While Amphicoelias and Bruhathkayosaurus lead the pack in terms of extreme weight estimates, other sauropods were also incredibly massive:
- Argentinosaurus: A titan from Argentina, widely recognized for its immense size and robust skeletal structure, estimated at 75 tons.
- Breviparopus: Known primarily from a massive trackway, suggesting a colossal sauropod around 72 tons.
- Bustingorrytitan and Puertasaurus: Both South American giants, estimated to weigh approximately 70 tons each.
- Patagotitan: Another Patagonian behemoth, weighing in at an estimated 68 tons.
- Alamosaurus: A North American sauropod that was one of the last non-avian dinosaurs, with an estimated weight of 65 tons.
In conclusion, while the term "fattest" is colloquially used, Amphicoelias and Bruhathkayosaurus are the top candidates for the heaviest, or most massive, dinosaurs, each estimated at 120 tons.
