Dicraeosaurus

Dicraeosaurus was about 14 to 15 metres (46 to 49 feet) long and weighed around 5 to 6 metric tons (5.5 to 6.6 short tons). That is roughly as long as two school buses.34

Dicraeosaurus was a herbivore, meaning it ate plants. It likely browsed on low-level vegetation no more than 3 metres (about 10 feet) off the ground, using its peg-like teeth.34

The forked spines on its backbone likely provided attachment points for muscles, which helped support its neck. They might have also supported a small sail or fatty ridge, but scientists aren't sure.34

Dicraeosaurus lived during the Late Jurassic period, about 155 to 151 million years ago.34

Fossils of Dicraeosaurus were found in the Tendaguru Formation in Tanzania, Africa. The first fossils were discovered by Werner Janensch and Edwin Hennig between 1909 and 1912.34

Dicraeosaurus was about 14 to 15 metres long, which is longer than a T. rex, but it was lighter, weighing around 5 to 6 metric tons. T. rex was heavier and more robust.3