|Height||12feet, up to 60ft using their size-changing power.|
|Behind the Scenes|
|Universe||Ben 10 Universe|
Vaxasaurians are an extraterrestrial species of saurians from the Earth-like planet Terradino.
In their normal size Vaxasaurians resemble humanoid dinosaurs with four-fingered hands that have ape-like nails on the end of each. Their feet are elephant-like and have three toes. They naturally have either green eyes with no pupils or red eyes with cat-like pupils, along with brow-like extensions. Their teeth are white and almost human-like with the exception of a few fangs.
Male Vaxasaurians are tan, brown, beige, dark green or gray with lighter-colored underbellies. The front of the neck and the side of the arms that face the body are also light colored. Certain Vaxasaurian males have naturally occurring weapons on the ends of their tails, resembling a plethora of medieval weaponry including maces, swords, war hammers, and battle axes.
Females have medium red skin and slightly darker underbellies. Their chins are slimmer and they have stripes around their body that are the same color as the skin but darker. They also appear to have feminine breasts similar in appearance to those found on female humans, hinting the species to be more mammalian than reptilian.
Vaxasaurians are able to grow in size at will; as they grow, their dinosaurian features start to become pronounced, including stegosaurid back plates and thagomizers on the tail. Also, on the shoulders, three plates separate and grow along with the plates on the forearms. On the top chest plate, a small triangular extension forms on the bottom while the bottom sides stretch down and curve towards the center, ending at a point. The legs also seem to become slightly longer.
Vaxasaurians are strong enough to temporarily survive in space without any special equipment. They are also able to throw an object into near orbit and can lift a To'kustar with ease. Their thick hide makes them durable against most attacks. They are also quite agile for their size.
Vaxasaurians have trouble lifting a Tyrannopede, which is their natural predator. They are also very slow, unable to fit in tight places, and vulnerable to electricity.
Vaxasaurians' natural predator is a Tyrannopede. These apex predators can easily defeat and devour a Vaxasaurian with their powerful jaws, enhanced strength, and ability to snare their prey with a heavy coated web.
- Vaxasaurians can occasionally be seen in clothing. The attire can include caveman-like loincloths, stone-based accessories and/or bones and skulls of other species.
- Like humans, a Vaxasaurian can develop a need for glasses.
- Vaxasaurians can evolve into Evolved Vaxasaurians.
- According to Duncan Rouleau, the Omnitrix from the Ben 10 reboot contains Vaxasaurian DNA. Therefore, Humungousaur was one of the countless aliens whose DNA pod was glimpsed in the episode "Innervasion Part 5: High Override" before being added to the active playlist for Season 3.