Brontosaurus vs. Brachiosaurus: What’s The Difference? 8 Facts

The main thing that makes Brontosaurus and Brachiosaurus different is how they look.

Brachiosaurus is a giraffe-like dinosaur, while Brontosaurus is an elephant-like dinosaur.

Brontosaurus was also one of the longest dinosaurs in the world, while Brachiosaurus was one of the tallest.

Brontosaurus and Brachiosaurus were both huge sauropods that lived from the end of the Jurassic to the beginning of the Cretaceous and from the middle of the Jurassic to the end of the Jurassic, respectively. The Brontosaurus is one of the best-known dinosaurs.

What is a Brontosaurus?

Brontosaurus was a large sauropod dinosaur that lived between 163.5 million and 100.5 million years ago, during the late Jurassic and early Cretaceous periods.

It is a well-known type of dinosaur. Brontosaurus was put in the Apatosaurus genus because it looked a lot like Apatosaurus.

But because of how different they were, these dinosaurs were put in a different genus. The three species are B. excelsus, B. yahnahpin, and B. parvus. The Greek word for Brontosaurus means “thunder lizard.”

This huge dinosaur’s long, whip-like tail, which it used as a weapon, is what makes it stand out. Like Brachiosaurus, they ate plants and had long necks.

Brontosaurus vs. Brachiosaurus

In contrast to Brachiosaurus, Brontosaurus had shorter front legs than back legs. A typical dinosaur was about 30 1/2 tons heavy. Also, they were one of the longest dinosaurs in the world.

What is Brachiosaurus?

Brachiosaurus has a long neck and is about the size of a giraffe. The name “Brachiosaurus” means “arm lizard” because of how long its arms were.

Between 155.7 million and 150.8 million years ago, they lived in North America, Africa, and Tanzania. It was able to keep its neck straight because its front legs were longer than its back legs.

Because of this, it is thought to be one of the tallest dinosaurs in the world. They stood between 40 and 50 feet tall and were more than 50 tons heavy.

They ate plants like cycads, ginkgo trees, and conifers. These huge dinosaurs ate up to 400 kg of dry plant matter every day. Unlike most dinosaurs, this one had a big nare that stood out across the top of its head. It also had a short tail.

Comparing Brontosaurus vs Brachiosaurus

Alternative NameThunder lizardArm lizard
SizeHeight – 28 feet
Length – 72 to 85 feet
Weight – 33,000 pounds
Height – 40 feet
Length – 60 to 70 feet
Weight – up to 128,000 pounds
EraLate Jurassic – 157 to to 145 million years agoLate Jurassic – 161 to 145 million years ago
Body ShapeLong, thin neck, small head, heavy body, long whip-like tail.
Elephant like
Small head, extremely long neck, muscular tail.
Giraffe like
LimbsFront legs slightly shorter than hind legsFront legs larger and longer than hind legs
NareNo nareLarge nare over skull, between eyes
HabitatOpen plains and marshy areasOpen plains and forests
Social StructureSolitaryHerd animal
DietAte vegetation at ground levelHigh browser – ate from canopies of trees
PredatorsAdults – no predators
Juveniles – Allosaurus and CeratosaurusLikely only Allosaurus preyed on the young, injured, or weak

The 5 Key Differences Between Brachiosauruses and Brontosauruses

On the surface, brachiosaurus and brontosaurus look a lot alike. They are both huge, towering herbivores. However, there is much more to them than meets the eye.

They didn’t have many predators because they were so big, and they both had long necks and small heads.

Even though they have some similarities, there are many important differences that make them different.

Brachiosaurus vs Brontosaurus: Size

The main difference between brachiosaurs and brontosaurs is that brachiosaurs were bigger.

Even though they are both very big dinosaurs, the first one is longer, and the second one was usually taller. Brontosaurs could be up to 28 feet tall and weigh up to 33,000 pounds. But because of their long necks and tails, they could grow to be 72 to 85 feet long.

Even though brachiosaurs were longer, they had the upper hand because they were taller.

Brachiosaurs were 40 feet tall and 60 to 70 feet long.

They were also a lot bigger and weighed a whopping 128,000 pounds more.

In contrast, an African bull elephant, which is the largest living animal, weighs about 12,000 pounds on average.

This means that the brachiosaurus probably weighed as much as ten African elephants.

Brachiosaurus vs Brontosaurus: Limbs

Another big difference between brontosaurus and brachiosaurus is the length of their legs.

The front legs of Brachiosaurus were longer than their back legs, but the front legs of Brontosaurus were shorter than their back legs.

Brachiosaurus vs Brontosaurus: Body Shape

As we’ve already said, Brachiosaurus was taller than Brontosaurus, and its front legs were shorter than its back legs.

This shows that they had different body shapes and ways of standing.

Because brachiosaurus had longer forelegs, its body naturally leaned down, but brontosaurus’s body leaned slightly in the opposite direction, giving it a hunched look.

Even though they had long necks and small heads for their size, the length of their legs and the shape of their bodies made them walk differently.

Brachiosaurus had a strong tail, and their necks were shaped like an “S” when they stood up.

Most of the time, brachiosaurs are said to look like giraffes.

Brontosaurus, on the other hand, is said to have been “shaped like an elephant.”

Brachiosaurus held their necks up higher than Brontosaurus did.

Instead, they stretched their necks out so far that they were almost parallel to the ground in front of them.

So, to balance out their long neck, they had to have a very long tail.

Their tail was long and thin, and at the end, it looked like a whip.

Scientists think that brontosaurs could whip their tails and make a sound louder than a cannon by doing so.

Brachiosaurus vs Brontosaurus: Nare

Nares are big holes in the top of the brachiosaurus’s head that look like a big bump right in front of their eyes.

Brontosaurus do not have these big noses.

It is thought that the nares on Brachiosaurus were there because of the air sacs that were also in the neck.

These air sacs were connected to the lungs and ran the length of their neck.

Brachiosaurus vs Brontosaurus: Diet

Both the brachiosaurus and the brontosaurus were herbivores, which means they ate plants.

But where they ate made a difference in what they ate.

Because of differences in how they worked, Brachiosaurus ate high in the air, while Brontosaurus ate on the ground.

Because it was so tall, Brachiosaurus was able to eat from the tops of trees.

So, Brachiosaurus ate plants that were between 16 and 30 feet tall.

Brontosaurus vs. Brachiosaurus

What are the Similarities Between Brontosaurus and Brachiosaurus?

  • Brontosaurus and Brachiosaurus are two giant dinosaurs.
  • They are herbivores.
  • Both are sauropod dinosaurs.

Brontosaurus vs. Brachiosaurus Examples

Brontosaurus Examples

  • Brontosaurus Excelsus
  • Brontosaurus Parvus
  • Brontosaurus Yahnahton.

Brachiosaurus Examples

  • Brachiosaurus Alataiensis de Lapparent
  • Brachiosaurus Zbyszewski
  • Brachiosaurus Lusotitan

Brontosaurus vs. Brachiosaurus Pros and Cons

Brontosaurus Pros & Cons

Pros of Brontosaurus

  • Brontosaurus is a well-known dinosaur that has been shown in movies, on postage stamps, in ads, and in many other places.
  • The body of Brontosaurus was longer than the body of Brachiosaurus. B. excelsus is a species that is similar to Brontosaurus.It is thought to have been 8.5 meters tall. This lets them eat in the trees and on the roofs.

Cons of Brontosaurus

  • Brontosaurus were slower and less active than other dinosaurs because they were so big.
  • Due to their tall bodies and straight necks, brontosaurus were hard to feed on the ground.

Brachiosaurus Pros & Cons

Pros of Brachiosaurus

  • Because of the way their teeth are shaped, Brachiosaurus can eat better than other sauropods.
  • The front legs of Brachiosaurus are longer than their back legs, which lets them walk farther.

Cons of Brachiosaurus

  • Like many other sauropods, Brachiosaurus could not have stood on its hind legs to eat higher plants.
  • Most of the time, Brachiosaurus walk alone, especially when they are eating. This makes them easy to catch.


Brontosaurus and Brachiosaurus are two huge dinosaurs that have gone extinct. Both of them had long necks and were sauropods.

As was already said, Brontosaurus and Brachiosaurus are different because of the size and shape of their bodies.

FAQ’s (Frequently Asked Questions)

Are brachiosaurus and brontosaurus from the same family group?

No, even though they were both sauropods (a type of dinosaur with long necks, small heads, long tails, and big legs and bodies), they did not come from the same family.

Brontosaurus was in the family Diplodocidae, which had some of the longest sauropods in the world.

The Brachiosauridae family was made up of some of the tallest dinosaurs, including Brachiosaurus.

Brontosaurus vs. Brachiosaurus

Did brachiosauruses and brontosauruses live alongside each other?

Yes, during the late Jurassic period, both Brachiosaurus and Brontosaurus did well in the same places, especially in what is now North America.

Since they were alive at the same time for so many years, it’s likely that they lived together.

Were brachiosauruses and brontosauruses dangerous?

Even though they were very big, brachiosaurs and brontosaurs were both kind.

They were both big herbivores that didn’t have many enemies, so they didn’t have to fight with other animals.

The brontosaurus’s tail, which was very long and thin and could swing with a lot of force, was probably the most dangerous part.

Why were brachiosaurus and brontosaurus called arm lizard and thunder lizard?

Brachiosaurus was nicknamed “arm lizard” because its forelegs were longer than its hind legs.

The name “thunder lizard” comes from the Greek word “brontosaurus,” which means “thunder lizard.”

What was the lifespan of brachiosauruses and brontosauruses?

It is thought that both brachiosaurs and brontosaurs lived for about 100 years.

Were there any dinosaurs larger than brachiosaurus?

Most people think that sauropods were the biggest and heaviest dinosaurs, and for a long time, people thought that Brachiosaurus was the biggest dinosaur that ever lived.

At the moment, scientists think that titanosaurs like Argentinosaurus were bigger than Brachiosaurus.

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