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Brachiosaurus altithorax by briankroesch Brachiosaurus altithorax by briankroesch
"Arm Lizard"

Brachiosaurus was one of the tallest and largest dinosaurs yet found. It had a long neck, small head, and relatively short, thick tail.
Brachiosaurus walked on four legs and, like the other Brachiosaurids and unlike most dinosaurs, its front legs were longer than its hind legs. These unusual front legs together with its very long neck gave Brachiosaurus a giraffe-like stance and great height, up to 40-50 feet (12-16 m) tall.

Brachiosaurus was about 85 feet (26 m) long, and weighed about 33-88 tons (30-80 tonnes). It had a claw on the first toe of each front foot and claws on the first three toes of each rear foot (each foot had five toes with fleshy pads).

Like other Brachiosaurids, it had chisel-like teeth, its nostrils were on the top of its head, and it had large nasal openings indicating that it may have had a good sense of smell. Brachiosaurus had 26 teeth on its top jaw and 26 on the bottom for a total of 52 teeth towards the front of the mouth.

Brachiosaurus was an herbivore, a plant eater. It probably ate the tops of tall trees with its large spatulate (chisel-shaped) teeth. It swallowed its food whole, without chewing it, digesting the plant material in its gut.

Brachiosaurus lived in the middle to late Jurassic period, about 156-145 million years ago, near the middle of the Mesozoic Era, the Age of Reptiles. Some dating estimates have Brachiosaurus surviving until 140 million years ago, during the dawn of the Cretaceous period.
Among the contemporaries of Brachiosaurus were other giant Sauropods including Camarasaurus, Supersaurus, Ultrasauros, and Haplocanthosaurus.

Brachiosaurus was a terrestrial animal. It was assumed for many years that giant sauropods spent most of their time in water, letting the water support their weighty bodies while breathing through their lofty nostrils. Now it is believed that they were fully terrestrial, just as Elmer S. Riggs, who first described Brachiosaurus, argued in a 1904 article. He believed, as most modern scientists do, that Brachiosaurus' feet and limbs were not broad enough to support the heavy animal in mud, that its back was flexible enough to support it on land, and that its chest was narrow and deep, which is insufficient for breathing underwater, and inconsistent with modern-day water-dwelling large animals (like hippos).

A healthy, adult Brachiosaurus probably had no predators. The largest-known meat-eaters from that time (the late Jurassic period) and place (North America and Africa) were Allosaurus, Ceratosaurus, and Torvosaurus. These theropods were less than half the size of Brachiosaurus, and probably had much easier prey to hunt (like smaller sauropods and ornithischians like stegosaurs).

Brachiosaurus and some of the other large sauropods (the huge long-necked plant-eaters) needed to have large, powerful hearts and very high blood pressure in order to pump blood up the long neck to the head and brain. The heads (and brains) of Brachiosaurus was held high (many meters) above its heart. This presents a problem in blood-flow engineering. In order to pump enough oxygenated blood to the head to operate Brachiosaurus' brain (even its tiny sauropod brain) would require a large, powerful heart, tremendously high blood pressure, and wide, muscular blood vessels with many valves (to prevent the back-flow of blood). Brachiosaurus' blood pressure was probably over 400 mm Mercury, three or four times as high as ours.

Herds: Brachiosaurus probably travelled in herds and may have migrated when they depleted their local food supply.
Eggs: Brachiosaurus may have hatched from eggs, like other sauropods. Sauropod eggs have been found in a linear pattern and not in nests; presumably the eggs were laid as the animal was walking. It is thought that sauropods did not take care of their eggs.
Life Span: Sauropod life spans may have been in the order of 100 years.
Defense: Brachiosaurus' best defense was size. In addition, its long tail could whip away most attackers. Also, they had leathery skin, although this wasn't much of a defense against long, sharp theropod teeth. They also had clawed feet that were more pronounced in the young.
It used to be thought that the sauropods (like Brachiosaurus and Apatosaurus) and Stegosaurus had a second brain. Paleontologists now think that what they thought was a second brain was just an enlargement in the spinal cord in the hip area. This enlargement was larger than the animal's tiny brain.

Brachiosaurus was a sauropod, whose intelligence (as measured by its relative brain to body weight, or EQ) was the among the lowest of the dinosaurs.

Brachiosaurus was quadrupedal, walking on four legs. Unlike most other dinosaurs, the front legs were longer than the hind legs.

Brachiosaurus was first found in the Grand River Valley, in western Colorado, USA, in 1900. This incomplete skeleton was described by paleontologist Elmer S. Riggs, who named Brachiosaurus in 1903. In 1909, Werner Janensch found many Brachiosaurus fossils in Tanzania, Africa. Many Brachiosaurus fossils have been found, in North America and Africa.

Brachiosaurus belonged to the:
Kingdom Animalia (animals)
Phylum Chordata (having a hollow nerve chord ending in a brain)
Class Archosauria (diapsids with socket-set teeth, etc.)
Order Saurischia - lizard-hipped dinosaurs, the ancestors of birds
Sauropodomorph - long-necked, long-tailed plant-eaters who walked on four legs
Suborder Sauropoda - very large herbivores
Neosauropoda - advanced sauropods
Family Brachiosaurid - nasal crests on the top of the head and for most, the front legs were longer than their rear legs, giving them a giraffe-like stance
Subfamily Brachiosaurinae - the largest land animals which included Brachiosaurus, Ultrasauros, Seismosaurus, and others
Genus Brachiosaurus -
Species - the type species is B. altithorax (Riggs, 1903). Other species include: B. atalaiensis (de Lapparent & Zbyszewski, 1957), B. brancai (Janensch, 1914)

Text credit to:

Drawn by Brian Roesch.
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Majestic-Colossus Featured By Owner Jan 29, 2017
Nice, I like the shape so much!
Paleo-King Featured By Owner Jun 28, 2009  Professional Traditional Artist
Nice job, it looks very accurate and the skull (bravo) looks distinctly different from B. brancai but still similar enough to be the same genus.

Really like the skull, the only thing that needs fixing is the teeth. They are a bit too thin and sharp like those of a predator (but they all seem to be arranged in the right order regardless).
Night-Blizzard Featured By Owner Jan 12, 2007  Hobbyist Digital Artist
Wonderful Job! Braichiosaurus is my favorite dinosaur EVER!
briankroesch Featured By Owner Jan 13, 2007  Hobbyist Traditional Artist
Thanks buddy. :0)
Night-Blizzard Featured By Owner Jan 13, 2007  Hobbyist Digital Artist
Mountaineer47 Featured By Owner Apr 30, 2006
I wish it were bigger so I could see all of your detail! It's beautiful! Probably my favorite sauropod, and I'm not a sauropod fan. :)

-Erin ^_^
briankroesch Featured By Owner May 1, 2006  Hobbyist Traditional Artist
Okay, let me try to find the original and I'll resize it to a larger version. :0)
Mountaineer47 Featured By Owner May 1, 2006
I don't want it to be too much of a problem, of course, but I'm psyched! I can't wait to see what it looks like larger! Can you send me a note to let me know when you put up the resized version? Be a pal? :w00t:

briankroesch Featured By Owner May 4, 2006  Hobbyist Traditional Artist
Okay. :)
shiverz Featured By Owner Jul 23, 2005  Professional Traditional Artist
An excelent job on this magnificent HUGE creature! The detailed drawings of the skull are almost perfect, aswell as the flesh version below it :)

Interesting pattern scheme on the Brachi's body, I really adore the extra spines down the back!
briankroesch Featured By Owner Jul 23, 2005  Hobbyist Traditional Artist
Thanks. Yeah, it is one of my favorites.
jeffquinn Featured By Owner Jun 14, 2005
excellent job on this one! Your reconstruction of the skull is very detailed and accurate, and your life recon is great too!
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June 13, 2005
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