Among the most impressive herbivores on Skull Island fairly numerous are the mighty Ferrucutus, a herd-dwelling dinosaur, found in groups or sole individuals. Herds can number up to around 12 individuals. Heavily built grazers/browsers with massive shoulders and enormous frills of bone and spike, these powerful animals are dangerous prey for the island’s carnivores.
Despite their fearsome aspect and aggressive manner, Ferrucutus are exclusively herbivores, eating low shrubbery and using their nasal horns to uproot tall cycads to get to the fruit in the tender crown of the plants. Ferrucutus herds tend to follow the Brontosaurus herds, exploiting any jungle cleared by the huge animals. Jungle cleared by Brontosaurus herds is quickly reduced to grassland by these shrub-browsing ceratopsids, their hard beaks making short work of the thorns and woody stems. Skull Island dung beetles will follow herbivores like these and eat their scat.
Herds are strongly territorial, and will claim and defend a small area as their own, where eggs are laid and their young are raised, giving them time to develop in relative safety. Young immediately join the herd upon hatching and gain the protection of the group from such attackers as Lycaesaurus and Pugbat's.
All herds are led by a male, who will fight off any challenger to his rule or any threat to his herd. When threatened by a predator, the females instinctively will gather in a circle around the young, presenting a wall of outward-facing horns and bony shields to an attacker while the dominant male will then rush forward to challenge the intruder. Males will charge, counting on their horns, shield, and massive neck and shoulder muscles to carry the day. Ferrucutus will also bite if needed, and their sharp beaks are capable of shearing through woody stems work as well as flesh and bone. Their body is full armor showing to be good for endurable body to take attacks from predators to fight back. Their shown to heavy body but can move in high speed to run from predators if have too. Their size makes most predators back off. Even the biggest and hungriest V.Rex will think twice about tackling an enraged bull Ferrucutus.
The head armament of a Ferrucutus is primarily used in dominance fights between adult males contesting lordship of their small herds of females and young. Intensely territorial and pugnacious, adult bulls can grow to almost half again as large as a cow. They collect small harems and guard them jealously.
Young males gather in "bachelor herds," practicing their sparring skills with playful bouts until they are large and strong enough to challenge a reigning male for their own dominance in a herd.
Fights between males are frequent, and can be violent and bloody, with injuries not uncommon and death not unheard of. Even superficially wounded bulls can die of nasty infections later.
Ferrucutus has the typical shape of a ceratopsian, with a heavy rhino-like body, a thick yet short tail, and a tall, oval-shaped bony shield extending up from the back of the head and over the shoulders. This shield has a series of spikes projecting from the edge, with two long horns coming off the nose. It is 24-34 feet long. The Ferrucutus seems to resemble a Pachyrhinosaurus, a smaller ceratopsian from the Late Cretaceous.
With powerfully muscles shoulders and huge, heavy skulls, the skeletons of Ferrucutus are heavily reinforced. Huge forelimbs give them traction in head sparring and in uprooting stubborn plants. The neck is built to transmit impact from the skull and spreads it throughout the body, diffusing jolts as males fight. All the limbs are drawn directly under the body to support the animals’ sturdy physique.
“The larger the frill, the more senior the animal” seems to be the rule among the ceratopsians of Skull Island, especially with Ferrucutus. Starting out small in juveniles, the frills of the Ferrucutus grow throughout their lives, with the older individuals sporting huge and elaborate horned frills. Adult females have large frills and horns, but by far the most impressive arrays are those of the big adult males. Some bulls have horns over six feet long. In mature individuals, the face of the frill above the brows will change color in the breeding season to indicate readiness to mate. In some cases this display is enough to intimidate a competitor into giving up before any violence occurs. Among females, the secondary cheek horns are barely noticeable and the small horns at the center top of the frill rarely grow long enough to cross. Only the largest males develop a full crossover, and this is good measure of the age of the individual.