Due to his gender, he is orange with a reddish tint on his head.
Dragonfly, along with Alpha, are first seen as hatchlings who grow to despise each other as they mature. He is the eldest of his siblings and, due to his short attention span and distraction towards insects, has been nicknamed so.
To teach him to hunt, Dragonfly's parents attack a herd of Saltasaurus (Alpha being one of the babies in the herd). They confront the adult Saltasaurs but Dragonfly alerts his mother to the Saltasaur calves. She turns her head, spots them, and directs their assault on the calves, devouring three of them. As the adult Aucasaurs and the young females pass by, Alpha comes face-to-face with Dragonfly (this is their first encounter). Luckily, a grasshopper flies by and Dragonfly starts to chase it, and Alpha survives.
As Alpha enters adolescence, she meets Dragonfly again, this time in the wildlands. While Alpha and her herd head for a forest to eat, Dragonfly and his family are right behind them. Dragonfly eagerly darts towards Alpha. She startles him with a bellowing growl, and he jumps away. The Aucasaur pack trots ahead. As Alpha browses from a tree, another female Saltasaurus comes forward and angrily shoves her aside to eat the leaves, but stumbles on a log, and tumbles down a hill, breaking bones. Alerted by the screams of pain and torment, the Aucasaurus pack heads over to her and kills the wounded animal, with one Aucasaur piercing the Saltasaur's jugular. As they eat, Dragonfly slams his thigh into one of his sisters, but his father scolds him for this action and his rude behavior. The pack continues to eat. The next day, Dragonfly wakes up from a good sleep, gets to his feet and heads off to look for a mate to start a pack with, since he knows that as long as he stays, he'll end up being scolded by his father.
Alpha meets Dragonfly again, this time in the forest. Dragonfly is skirting the herd watching Alpha with greedy eyes. Alpha is worried about Dragonfly, and she is unable to take her eyes off him. She is not paying attention to the road, and she trips over a fallen log. She does not quite fall, but she is wounded making her an even potential easier meal for Dragonfly later.
Later, he finds a female Aucasaur around his age and attempts to seduce her by inflating his throat pouch, but she at first refuses. However, his persistence and inflating of his throat pouch finally win her heart, and they become mates.
A while later the pair are on the hunt and find a Saltasaur carcass they can feast on. But while their eating a pair of larger Carcharodontosaurs come in and steal the carcass from the pair to the disappointment of Dragonfly (this is shown at the beginning).
In the end, while Alpha looks for a spot to eat, she encounters Dragonfly and his mate and readies herself for a duel with them. Dragonfly bares his teeth and goes for an attack. Alpha headbutts him, knocking him off balance, and whips the female Aucasaurus with her tail, knocking the female Aucasaurus off her feet. Dragonfly recovers and charges, and is then rammed by Alpha, who disorients him for a short time. He wakes up from his disorientation and clamps his jaws on Alpha's left shoulder, but he loses his grip and Alpha shakes him off his feet. However, Alpha loses her balance and falls on him, crushing his skull under her weight. He is dead instantly. Alpha then rises to her feet, stares at Dragonfly's dead body and walks away, having won the duel. The Aucasaur female rises to her feet, having just witnessed the whole thing, and tries to wake Dragonfly up. To her horror, her attempts to awaken Dragonfly fail miserably, and this causes her to throw her head backwards and let loose a loud, mournful roar.
- Dragonfly's death is based on the discovery of an Aucasaurus with a crushed skull.