Zavacephale: A New “Dome-Headed” Dinosaur from Mongolia with the Strangest Head of 2025!

In April 2025, paleontologists published in the journal Nature a new pachycephalosaurid species named Zavacephale rincheni – the first “dome-headed” species described from Mongolia in decades.

The fossil was unearthed from the Bayanshiree Formation (Late Cretaceous, approximately 85–90 million years ago) in the Gobi Desert. The specimen includes a nearly complete skull along with several other bones, revealing a small, herbivorous bipedal dinosaur (about 2–2.5 meters long).

The most remarkable feature of Zavacephale lies in its extremely unusual “cranial dome”: a high and steeply sloping skull with deep grooves, ridges, and a complex bone structure never before seen in any other pachycephalosaur. Researchers believe this “head-ʙuттing” wasn’t just for headʙuттing, but also served as a display or Sєx/species identifier. Some features even suggest it may have produced sounds or changed color seasonally.

Zavacephale rincheni is named in honor of the Mongolian paleontologist Rinchen Barsbold. This discovery shows that the diversity of pachycephalosaurs in Asia was much greater than previously thought, and that they developed very distinct head “helmets” as early as the mid-Cretaceous period.

As of June 2026, Zavacephale remains one of the most talked-about dinosaur discoveries of 2025, hailed as the “stranger” with the most bizarre head in the pachycephalosaur world. Mongolia continues to prove itself a “paradise” for unique dome-headed dinosaurs.