The thickened and laterally extended postfrontals horn-like bosses reduced the chance of the head of one opponent slipping past the head of the other. More recently, Julien Benoit and colleagues have shown that the head of Anteosaurus had a natural posture that was less tilted downwards than that of the tapinocephalids and that, unlike the latter, it does not line up ideally with the vertebral column to optimize a head-to-head combat. This peculiarity associated with the presence of a pachyostosis less developed than that of the tapinocephalids and the retention of a large canine led these authors to suggest an agonistic behavior in which Anteosaurus more likely used its large canines for displays and/or during confrontation involving bites. According to Christian Kammerer, the pachyostosis of Anteosaurus would have mainly allowed the skull to resist the cranial stress generated by the powerful external adductor muscles during the bite on a large prey, as has been suggested in other macropredators with a thickened supraorbital region such as rubidgeine gorgonopsians, mosasaurs, some thalattosuchians, sebecosuchians, rauisuchians and various large carnivorous dinosaurs. All these authors, however, do not exclude a multiple use of this pachyostosis and the existence in Anteosaurus of a head-butting behaviour requiring however less energy than that of the Tapinocephalidae. Ontogeny Ashley Kruger and team in 2016 described a juvenile specimen of Anteosaurus (BP/1/7074), providing details into the ontogeny of this anteosaurid. Analyzed allometry between this specimen and others suggests that the cranial ontogeny of Anteosaurus was characterized by a rapid growth in the temporal region, a significant difference in the development of the postorbital bar and suborbital bar between juveniles and adults, as well as a notorious pachyostosis (bone thickening) during development, which ultimately modified the skull roof of adults. Consequently, pachyostosis was responsible for thickening important skull bones such as the frontal and postfrontal which were of great importance in the overall paleobiology and behavior of Anteosaurus. Kruger and team noted that these differences, when compared, are extreme between juvenile and mature Anteosaurus individuals. In 2021 Mohd Shafi Bhat histologically studied several skeletal remains of specimens referred to Anteosaurus, finding three growth stages. The first growth stage is characterized by the predominance of highly vascularized, uninterrupted fibrolamellar bone tissue in the inner bone cortex, which suggests rapid formation of new bone during early ontogeny. A second stage of growth in Anteosaurus is represented by periodic/seasonal interruptions in the bone formation,