Yutyrannus

Yutyrannus huali was a species of proceratosaurid tyrannosauroid that lived in the Early Cretaceous period about 125 million years ago. It roamed what is now northeastern China, with its fossils discovered in Liaoning Province, and is one of the largest feathered theropods that we know of. Its long feathers and bony crests were thought to have been used for display or thermoregulation. It was believed to have lived in temperate rainforest environments with harsh winters and may have been a pack hunter that preyed on sauropods and other, smaller creatures.

Tier: 3

Dimorphism: Males have light and brightly colored feathers, while females are darker and more earth-toned.

Habitat

Riparia: Redwoods, Hollow Hills, Wind Tunnels
Gondwa: Impact Crater, Dark Woods, Broken Tooth, Big Quill Lake, Stego Mountain

Diet: Carnivore

Active Times: Cathemeral (active during day and night)

Group Size: 6 related individuals

Attackers/Defenders: Up to 4 adults/sub-adults

Nesting Season: Spring

Offspring: up to 4

Adoption: ✅

Behavior

Yutyrannus are nomadic pack hunters. Their packs, usually family units, travel for miles in search of food. Yutyrannus use tactical hunting strategies to bring down prey when it is most vulnerable. They are territorial and aggressive toward almost all other dinosaurs outside of the breeding season, and usually only tolerate their own family members. Family packs consist of a set of parents and their offspring, and can be up to six individuals strong.

Mandatory Traits

Beautiful Feathered Tyrant

Males and females leave their family units after a year (four seasons) to find their own mates and start their own packs. Males use their striking feathers and crests for mating displays. They bring gifts of flowers, bloodstones, or nesting material to females and perform a sort of dance to show off their feathers (walking in circles, using ? emote, love calling, and showing both sides of their bodies to the female). Females tend to prefer males with scars, as these show they are experienced hunters and protectors, but they are mostly attracted to the vibrant colors of the males’ plumage and crests. When she chooses a mate, she accepts his gift and his love calls. She then leads him to her nesting site, where he continues to bring her materials and decorations to establish their new lifelong bond.

It Takes Two

Yutyrannus parents, which mate for life, raise up to four offspring every spring. Both parents take equal responsibility in rearing their young, and both spend significant time bonding with them, resting together in cuddle piles or preening one another. Yutyrannus parents do not leave their young unguarded, and one parent always keeps watch over the brood while the other fetches water or small prey. The guardian parent does not let the young leave their line of sight and keeps them close with gentle, low rumbles and clicks.

Peace in Order

Yutyrannus packs follow a strict dominance hierarchy that preserves cohesion and structure within the group. The way they hunt and the order in which they eat is determined by this hierarchy:

Mature Female (most dominant)
Mature Male
Oldest offspring
Youngest offspring (least dominant)

This hierarchy is duly respected by all pack members, however when young Yutyrannus mature at about one year of age, they are no longer seen as subordinates of their parents and are instead seen as rivals. Yutyrannus parents must forcibly disperse their young by the next Spring season.

Yutyrannus parents spend some time with their adult offspring, as they only reach maturity after 4 seasons.

Flush and Strike

Hunts can be initiated by the mature male or female of the group. These hunts may take place during the night or day, when preferred herbivores are sleeping or grazing. When Yutyrannus target a herd, they attempt to isolate the most vulnerable member, which tends to be the herd’s young.

A mature Yutyrannus approaches its prey loudly and aggressively in order to startle it and cause it to bolt or break from its herd. When the prey flees, the Yutyrannus chases it into a clearing or gully where the rest of the family are waiting for the capture. The other mature Yutyrannus continues combat once the prey has been successfully cornered or surrounded.
The adolescent or sub-adult offspring flank the main attacking Yutyrannus to strike immediately after its attack or to provide support in case an attack is blocked or countered. The two youngest members of the group usually stay far back from these hunts, observing carefully the strategic cooperation of their family.
They vocalize excitedly during this process, growling and clicking to one another to communicate their positions.

This social hunting strategy increases the Yutyrannus’ success rate for taking down larger or well-hidden prey than they couldn’t hunt alone. The cooperation of the group brings each individual together and bonds them tightly.

Optional Traits

Watch and Learn

Yutyrannus young begin sharpening their hunting skills as soon as they reach the juvenile stage. Under their parents’ supervision, they start with small, weak critters and gradually move on to larger prey. Through play, they practice flushing small critters out of the understory and surrounding them. Young adolescent Yutyrannus can be seen watching their parents hunt migrating herbivores from a safe distance. The older adolescent offspring are known to participate in hunts, taking supportive roles (such as using healing calls) and flanking prey in coordinated efforts with their parents. Once they reach sub-adult age, they can become extremely aggressive in their pursuits.

Beautiful Feathered Tyrant II

Alioramus are a preferred prey of Yutyrannus simply because of their hostile nature. Alioramus will attack a Yutyrannus on sight, as they envy the magnificent plumage of the Feathered Tyrant. Yutyrannus do not attack Alioramus on sight; instead, they do not hesitate to overpower and kill this smaller, angry tyrannosaurid once provoked. To Yutyrannus, Alioramus make an easy meal of themselves, and as a result Yutyrannus look down on these dull-feathered dinosaurs, seeing them as mere prey.

Cretaceous Cuddlers

Once they are dispersed by their parents, Yutyrannus wander alone in search of a mate. In some cases, however, they may cross paths with Nanuqsaurus, a small, similarly feathered tyrannosaurid. If the Nanuqsaurus offers a piece of preferred prey to the Yutyrannus, a Flamekin bond may form between the two individuals. Solo Yutyrannus have even been observed forming this sacred bond with two Nanuqsaurus simultaneously. Yutyrannus are a particularly affectionate species toward those they are bonded to, and they can often be seen cuddled up close while resting, especially during winter.

One solo Yutyrannus may have up to two Flamekin Nanuqsaurus. They do not bond with other species due to their aggressive nature.
This Flamekin bond ceases once the Yutyrannus finds a mate.

Credits: Onlooker

Sources:
https://en.wikipedia.org/wiki/Yutyrannus
https://en.wikipedia.org/wiki/Harris%27s_hawk

Last Updated: 12/5/25