How Long Was the Largest Known Dinosaur Neck

How Long Was the Largest Dinosaur Neck?

If you are a dinosaur enthusiast, you may have wondered how long the neck of the largest dinosaur was. Dinosaurs are fascinating creatures, and the sheer size of some of them is mind-boggling. One of the most iconic features of many dinosaurs is their long necks. In this article, we will explore the fascinating world of the largest dinosaur necks ever discovered.

Largest Dinosaur Neck

Dinosaurs have been extinct for millions of years, but their remains continue to captivate us. From the smallest fossils to the largest ones, each discovery provides insight into the world of these incredible creatures. The necks of some dinosaurs were truly impressive, with lengths that are difficult to comprehend.

Dinosaurs with Largest Dinosaur Neck


When it comes to long necks, the first dinosaur that comes to mind for most people is the Brachiosaurus. This massive creature had a neck that was around 14 meters long (46 feet), making up almost half of its total length. However, the Brachiosaurus is not the dinosaur with the longest neck that we know of.

Diagram incorporating bones of both Brachiosaurus and Giraffatitan, by William Diller Matthew, 1915

The dinosaur with the longest neck is the Mamenchisaurus, a herbivore that roamed China around 160 million years ago. The neck of the Mamenchisaurus was around 12 meters long (39 feet), longer than any other dinosaur that we know of. This incredible length was made possible by the unique structure of the neck bones, which were longer and more numerous than those of any other dinosaur.

Other Impressive Necked Dinosaurs

Dinosaur NameLength of Neck (meters)Length of Neck (feet)DietTime Period
Brachiosaurus1446HerbivoreLate Jurassic
Supersaurus1446HerbivoreLate Jurassic
Sauroposeidon13.745HerbivoreEarly Cretaceous
Mamenchisaurus1239HerbivoreLate Jurassic
Omeisaurus1033HerbivoreLate Jurassic
Diplodocus930HerbivoreLate Jurassic
Apatosaurus (Brontosaurus)826HerbivoreLate Jurassic
Alamosaurus6.521HerbivoreLate Cretaceous
Tanystropheus620Carnivore/HerbivoreEarly Triassic
Euhelopus620HerbivoreEarly Cretaceous
Table of the top 10 dinosaurs with the longest necks

While the Brachiosaurus and Mamenchisaurus may have had the longest necks, there were plenty of other dinosaurs with impressive necks as well. The Diplodocus, for example, had a neck that was around 9 meters long. The Apatosaurus, which was previously known as the Brontosaurus, had a neck that was around 8 meters long.

An image showing the size of dinosaurs compared to a human

Even some of the smaller dinosaurs had long necks. The Tanystropheus, for example, was only around 6 meters long, but its neck made up more than half of its length. This ancient reptile lived around 240 million years ago and was not actually a dinosaur, but a relative of modern reptiles.

How Did Dinosaurs Use Their Necks?

The long necks of dinosaurs were not just for show. These impressive structures had several important functions. For herbivorous dinosaurs like the Mamenchisaurus, the long neck was used to reach high branches and leaves that other animals could not access. The neck of the Diplodocus, on the other hand, was used to reach down and graze on low-growing plants.

The necks of some carnivorous dinosaurs were also important tools for hunting. The long neck of the Allosaurus, for example, allowed it to reach out and grab prey from a distance.


The world of dinosaurs is full of surprises, and the length of their necks is just one of them. The Mamenchisaurus, with its incredible 12-meter neck, is the largest known dinosaur in terms of neck length. However, many other dinosaurs had impressive necks as well, and these structures were important tools for feeding, hunting, and communication.


How did dinosaurs with such long necks support their massive heads?

Dinosaurs with long necks had specialized adaptations in their vertebrae and musculature that helped support their heavy heads. Some dinosaurs had air sacs in their necks that lightened the load, while others had interlocking vertebral joints that helped distribute the weight evenly.

What was the purpose of such long necks for these dinosaurs?

There are several hypotheses about the purpose of long necks in dinosaurs, including foraging for food at different heights, thermoregulation, visual communication, and predator avoidance. It’s likely that the purpose varied depending on the species and environment.

How did these dinosaurs avoid getting their necks tangled or stuck in trees?

It’s not entirely clear how dinosaurs with long necks avoided getting tangled or stuck in trees, but some researchers believe that the necks were flexible enough to allow the dinosaurs to navigate through tight spaces. Other hypotheses suggest that these dinosaurs may have avoided heavily wooded areas altogether.

How did these dinosaurs communicate with each other, given their long necks?

It’s possible that dinosaurs with long necks used visual signals, such as posturing or changing the position of their necks, to communicate with each other. Some researchers have also suggested that these dinosaurs may have had vocalizations or infrasound communication that could travel long distances.

What other adaptations did these dinosaurs have that helped them survive in their environments?

In addition to long necks, many dinosaurs had other adaptations that helped them survive in their environments. For example, many had specialized teeth or beaks for eating specific types of vegetation, while others had armor or spines for protection against predators. Some dinosaurs also had long tails for balance or communication, or specialized feet for different modes of locomotion.

Leave a Comment

Your email address will not be published. Required fields are marked *