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Introduction to Zaothalaysaurus Dinosaur

Zaothalaysaurus is a strange and exciting dinosaur that remains largely unknown to many people today. It was a small carnivore that lived during the late Cretaceous period about 90 million years ago. It was discovered and first described in 2001 in a 200-million-year-old Persian fossil bed. The only known specimen of Zaothalaysaurus is fragmentary so much of its anatomy is unknown and yet to be explored. It’s strange features, however, have enticed many researchers to learn more about this mysterious creature.

Physical Appearance of Zaothalaysaurus

Zaothalaysaurus is classified as a theropod, a group of bipedal carnivorous dinosaurs with generally large heads and short tails. Based on its fossil remains, scientists estimate that Zaothalaysaurus was approximately 4-6 meters (13-19 feet) in length. Its height is unknown although it is estimated to have been a fairly small dinosaur. Its skull was long and narrow. Its jaws were slender and lined with small teeth. Looking at the fossil remains, it is thought that it likely fed on small animals and insects. Its eye sockets were positioned far back on its skull, indicating a good sense of smell and enhanced vision.

Unique Anatomical Features of Zaothalaysaurus

One of the most unique features of Zaothalaysaurus is its unusually long neck. As far as paleontologists know, this neck was longer than any other dinosaur of the same period. It’s unclear how it used this long neck. Some researchers speculate that it may have used it to make sudden lunges at prey, while others think it may have been used to scan the horizon for food. Whatever its purpose, its long neck certainly set it apart from many of its contemporaries.

Another fascinating feature of Zaothalaysaurus is its elongated ischia. Ischia are bones at the base of the hip which help support the tail and lower body. In Zaothalaysaurus, these bones are much longer than in other theropods, suggesting it not only had a very long neck, but an elongated tail as well. This could have been used for stability or for a better sense of balance.

 Zaothalaysaurus two

Behaviors of Zaothalaysaurus

Unfortunately, without any direct evidence from the fossil, scientists can only speculate about the behavior of Zaothalaysaurus. Its long neck and tail could suggest the presence of agile and sweeping movements in its pursuit of prey, or alternatively, it may have leaned forward and snatched prey from close range. Due to its slender jaw and teeth, it is likely that it was an opportunistic eater. It likely ate small plants, insects and lizards, but was not adapted to hunt larger prey. Based on its remains, paleontologists also believe that Zaothalaysaurus was more of a solitary creature than a pack hunter.


Despite having only fragmentary remains, Zaothalaysaurus has been an extremely interesting dinosaur to study. Its unique and strange features have allowed researchers to better understand the diversity of creatures that lived in the Cretaceous period. Its long neck and elongated ischia stand out as some of the most unique anatomical features known for any theropod dinosaur. Its behaviors and habits, although largely unknown, paint a fascinating picture of the small and mysterious Zaothalaysaurus.

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