They're an arboreal species- or at least, scansorial, preferring to hunt in the underbrush and bring their prey to the trees. Why do I say this?- Remember what Besteel did with Rovender and Eva after he captured them?
It makes me think of leopards that hang their prey up in treebranches to keep it safe for later consumption:
Maybe a bit of a stretch, because Besteel wasn't planning to eat them, and he had all sorts of other methods (containers, snaring them to the ground, etc.) of caging animals, but bear with me a bit. I honestly wouldn't be surprised if this was common for Dorceans, to keep later meals safe from scavengers, or maybe to display trophies.
Also look at their prehensile feet and sharp, hooked, claws:
Look at the strange way they grasp rod like objects:
Like gripping a tree branch! They're pedal graspers! Take these climbers in our animal kingdom as an example:
"But arboreal animals usually have long prehensile tails to help them climb!" You might say, and you'd be right! Dorceans noticeably lack a tail; however, maybe they didn't need tails. They already have eight limbs that can grip branches and support their body weight.
But what about their size? How could they keep their balance?- They are large, but noticeably compact- a good body structure to have in order to maintain balance. And Orbona's forests have some particularly ginormous trees that could easily bear a Dorcean's weight- maybe their homeworld was like that, as well.
Something else to note: Besteel had no problem chasing Eva through Lacus (save squeezing into tight spaces)- he literally jumped TWENTY METERS to get at her- that's about 65 feet! 6 stories!!!! And he didn't even seem shaken! (Again, maybe their size and robust body plans absorb shock- a means of handling descent).
So clearly Dorceans (well him and Redimus at least), showed no signs of fearing heights. That could be explained away by their frequent use of gliders, but what if it's something innate in the species?
What if gliders, if indeed invented by Dorceans, was originally intended to help them glide between giant trees? Maybe a stretch.
Now here's where I'm inserting my own headcanons and expounding on their sexual dimorphism:
Female Dorceans are much larger and heavier than the males; they cannot use gliders, and might be too big to effectively engage in arboreal locomotion. So instead maybe females, due to their weight, strictly hunted in the underbrush- occasionally herding prey towards the tree cover where a male could jump down and ambush it. The male could also help the female display her trophies or store food away where scavengers or other predators couldn't get it.
But I could be misinterpreting things.
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