Rob Stothard/Getty Images Europe/Getty Images
A juvenile allosaurus nicknamed "Young Al" is only the second specimen of its type ever discovered.
Summers Place
Another view of the dinosaur's remains, which are 150 -- 155 million years old.
An elephant bird egg -- one of the biggest bird eggs in history -- will also be auctioned.
Summers Place
A large giraffe skull dating from the early 20th century.
Rob Stothard/Getty Images Europe/Getty Images
The head of a full crocodile also goes under the hammer.
Summers Place
This woolly rhino skull (caementodon tongzinensis) measures just under two feet long and was found in China. It is up to 20 million years old.
Summers House
A stegosaurus tail spike, also found in Wyoming and just over one foot long.
Rob Stothard/Getty Images Europe/Getty Images
An Ice Age cave bear from the Carpathian mountains in Romania and around eight feet high.
A rare pliosaur (Liopleurodon ferox) skull. Pilosaurs were swimming reptiles which were distantly related to modern turtles.
Summers House
A skeleton of a Moa is also on sale. The now extinct flightless birds were native to New Zealand.
Summers House
A large rare spiny ammonite group.
Summers House
A rare penguin fossil weas found in South America and believed to date from the Miocene, around 20 million years ago.

Story highlights

A rare baby dinosaur goes under the hammer on Wednesday November 25

The dinosaur could sell for $750,000, experts believe

London CNN  — 

It is 150 – 155 million years old and the first dinosaur of its kind to be discovered in such good condition. But how much is a teenage fossil worth?

Paleontologists will find out Wednesday as an incredibly rare juvenile allosaurus goes under the hammer. The 9ft-long carnivore found in Wyoming and nicknamed “Young Al” is only the second juvenile allosaurus specimen to be found.

“This is a very exciting but nerve-wracking time for us,” Rupert Werff, director at auctioneers Summers Place, told CNN.

“The first juvenile allosaurus was just a couple of limb bones and three ribs, so this is by far the most intact specimen.”

New dinosaur species like 'a fat pony with a big head and horns'

The young dino was found by a professional fossil hunter, who asked to remain anonymous, in the Morrisson Formation, a rich fossil bearing area. But despite the hefty price tag, the anonymous owner is unlikely to profit from the excavation.

Werff said: “Dinosaur excavation is a pretty expensive business. The excavation took a big team three years to complete. Fossil hunting is not something you ought to do if you want to make a profit.”

Other items on sale at the auction house in Sussex, southern, England, include an enormous elephant bird egg, a wooly mammoth skull and a stegosaurus tail spike.