In Dracoriri, I plan to have a species of small dragon called a Malidge (by small, we mean about the size of a human). These dragons are red, shiny, and covered in plates instead of scales, a natural armor fitted so well together that it is virtually impenetrable, much like on a Mesmerake.
They are also solitary creatures, bipedal too, standing on reptilian talons but possessing a pair of clawed fingers at the ends of their forelimbs, which are used to cut up and collect vegetation for food. In fact, their entire body is like this, with a vaguely humanoid torso, reptilian limbs and tail, and a neck and head that is very clearly that of an insect's.
Typically, this spadelike head is held pointed down, the three horns protruding from the back of its head standing up, possibly for sensory reasons-these horns are tough but flexible and have been observed moving when a Malidge is agitated, curious, looking for something....you get the idea, and holding the head down would allow it to see the ground....
TL;DR: To a casual observer, Malidge may appear to be dangerous predators. They are in fact rather aggressive toward humans, almost unnaturally so, and they possess sharp fangs and claws, but they are herbivorous, eating wood and vegetation. Why would a herbivore be armed and aggressive?
The Best Answer Will:
Take into account a Malidge's traits and use them to glean information on what they would act like, as while I like biology, I am no expert and would like to fine-tune my creatures to make them at least somewhat realistic. Basically, I'm asking you to use what I have and what you know and be creative in answering this.
Focus on the point of the question; there is a lot of weird things going on with Malidge, like the wood-eating and the mixed biology, but the focus here is on the fact that this is a herbivore with the aggressive behavior (yes, I know herbivores can be aggressive too, but only a hippo is aggressive like a Malidge, or in other words, acting like a predator) and weaponry of a predatory animal. I would like a biological explanation for this behavior.
If possible, I would love it if the answer could include why Malidge are so aggressive toward humans and basically just humans-others they just remove or scare off, but humans they outright attack on sight. But, this is not necessary.
Finally, let me know if there are problems, I appreciate feedback and new perspectives!