In real life, Brachiosaurus were 50 ft high, 85 ft long and weighed up to 50 tonnes. But in the Ice Age 3, their full-size have been sizes up to be over 1000 ft in length. Besides this, the depiction was roughly accurate. They were indeed herbivorous
length: 70-100ft heigth: 50-60ft weigth: around 50 ton It could also be Alamosaurus or Girafititin.