Brontosaurus (Brontosaurus excelsus)—often called the “thunder lizard”—was one of the most iconic long-necked dinosaurs of the Jurassic Period. With its massive body, pillar-like legs, and sweeping tail, Brontosaurus represents the classic image of a giant sauropod moving across ancient floodplains.
Time Period
Brontosaurus lived in the Late Jurassic. In your site’s simplified filter, this is grouped under Jurassic. During this time, North America’s ecosystems supported many sauropods alongside large predators like Allosaurus.
Habitat
Most Brontosaurus fossils are linked to the Morrison Formation in the western United States. The Morrison represents a landscape of river channels, floodplains, and seasonal dry periods—an environment that could support enormous herds of plant-eating dinosaurs.
Size and Appearance
Brontosaurus is commonly reconstructed at around 20–22 meters long. Its long neck helped it reach vegetation at different heights, while its strong limbs supported a heavy torso. The tail was long and muscular, likely important for balance and possibly defense.
Diet and Lifestyle
Brontosaurus was an herbivore. It likely fed on ferns, cycads, conifers, and other plants. Like other sauropods, it probably swallowed vegetation in bulk and relied on fermentation in a large digestive system to extract nutrients.
Brontosaurus vs. Apatosaurus
For much of the 20th century, Brontosaurus was treated as the same dinosaur as Apatosaurus. More recent research argued that Brontosaurus has enough anatomical differences to be recognized as its own genus again. This debate is one reason Brontosaurus remains especially famous in dinosaur history.
