In my opinion, this is a cave-dweller, whatever creature it may be.
First of all, it not only has dew claws, which are used specifically for climbing and holding objects (such as a foothold or rock outcrop), but thick, curved claws, also for climbing. Evidently, if this were a cave dweller, the ability to climb on the ceiling and walls would be very beneficial to its survival.
Secondly, in addition to its climbing ability, the spines on its back could help protect it while clinging to the cave walls, making it difficult for predators to attack when the underside is pressed against a wall.
Additionally, its pupils are very dilated, allowing more light to come in from all angles, which would mean it could see more easily in dark caves.
One problem with this theory, however, is the mouth. The mouth is in the shape of a beak, which means that this is likely an herbivore (specifically a nut-berry eater), and though it could eat the mosses and small plants in the cave, its beak mouth would need to be sharper and perhaps a bit more scythe shaped. It is possible that the creature also eats insects, so it would have a diet similar to the Onyc.
Another possible problem is the tail. The tail seems to be used for tree climbing and hanging from branches, and would be fairly useless in a cave.
This is just my opinion, though I guess we'll find out how much is true once the mysterious mysteries are released!