00:05Skeletons from these large dinosaurs are in museums all over the world.
00:10These dinosaurs lived 153 million years ago.
00:14They were herbivores that ate plants.
00:17Their name means arm lizard.
00:19Whose bones are these?
00:23The skeleton is from the Brachiosaurus.
00:26This dinosaur had the longest front legs of all the large dinosaurs.
00:30The front legs carried all of its weight.
00:35The Brachiosaurus grew to 70 feet in length.
00:39It weighed close to 66,000 pounds.
00:42Its long neck could reach trees 50 feet high.
00:47Brachiosaurus was much bigger than a person.
00:50It had a very good sense of smell.
00:53Scientists believe that it got so big because of the food it ate.
00:57It had to eat a lot of plants to keep its muscles strong.
01:03Brachiosaurus bones were found in North America.
01:06Elmer Riggs found the first set of Brachiosaurus bones in 1900.
01:11He found the bones in the Grand River Valley of Colorado.
01:16Bones have also been found in Utah, Oklahoma, and Wyoming.
01:22Archaeologists competed against each other to find dinosaur bones.
01:27They wanted to be known for discovering new types of dinosaurs.
01:31This competition went on during the late 1800s and early 1900s.
01:38In 1909, Werner Janensch thought he found Brachiosaurus bones in Tanzania, Africa.
01:45Scientists later determined that the dinosaur was different than a Brachiosaurus.
01:50They named the African dinosaur Giraffatitan.
01:56The western part of the United States was home to many types of dinosaurs.
02:00It was full of trees, grasses, and bushes.
02:04It provided lots of food for all of the Brachiosauruses.
02:10A Brachiosaurus had 26 teeth on top of its mouth.
02:14It had 26 teeth on the bottom of its mouth.
02:18Its teeth were shaped like pencils and very sharp.
02:21A Brachiosaurus stripped the leaves off of the plant with its teeth.
02:27The Brachiosaurus ate cycads, ferns, and bushes.
02:31It also pulled leaves off of trees and swallowed them whole.
02:34It ate 440 pounds of leaves per day.
02:40The bones in the neck of the Brachiosaurus were 3 feet long.
02:44Its large skull had a bar in the middle of its forehead.
02:48The bar created a bulge at the top of its head.
02:53A Brachiosaurus had strong, powerful legs.
02:57Large bones were needed to help it walk and find food.
03:00Some of its larger bones were over 8 feet long.
03:05The tail of the Brachiosaurus was smaller compared to other dinosaurs.
03:10A tail was important for keeping the dinosaur balanced.
03:14Why didn't the Brachiosaurus fall forward?
03:17The Brachiosaurus did not fall because it had longer front legs.
03:24Some dinosaurs had to lift their front legs to eat from the tall trees.
03:28The Brachiosaurus did not need to lift its legs to eat.
03:32It had longer front legs that allowed it to hold its head high.
03:38Scientists believe that Brachiosauruses traveled in herds.
03:42Staying in a herd protected them from predators.
03:46After they ate all the plants in an area, they moved to a new place.
03:51Brachiosauruses were constantly on the move, looking for fresh leaves.
03:57Brachiosauruses did not lay their eggs in a nest.
04:00Most dinosaurs laid their eggs in nests.
04:04Instead, Brachiosauruses laid their eggs as they walked along.
04:08Baby Brachiosauruses had to fend for themselves after they were born.
04:14Scientists believe that predators left Brachiosauruses alone.
04:19Why?
04:21Brachiosauruses were huge and traveled in herds.
04:24Predators could easily hunt smaller prey animals.
04:29How fast did it move?
04:31A Brachiosaurus moved slowly.
04:34It did not need to move fast.
04:36It moved 10 miles per hour.
04:41A Brachiosaurus did not swim.
04:43It spent all of its time on land.
04:46It used its long neck to pull plants from the water.
04:50A Brachiosaurus was so heavy that it sank in the mud.
04:55Whose bones are these?
04:57These are the bones of Brachiosaurus, one of the largest and heaviest dinosaurs to ever walk the earth.
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