Humanity has spread out in the cosmos, colonizing various worlds, cataloging countless creatures, the usual interstellar species activities. One day, however, humanity finds a species that is arguably like them, yet very very different.
Appearance and behavior
The species, reasonable named demons, have the physique of a human, their hands and feet possessing claws that are capable of breaking rocks with a few punches and kicks. Their torso looks very similar to a humans torso, but is arguably much tougher and can resist a great deal of blunt force trauma. The head of the demons look like crow heads, the heads look like they are covered in small feathers but are actually covered in tiny black hairs, and On the back it sports two large bat like wings.
Now, the demons are called such a name because of how they act. They have been seen to destroy entire ecosystems on other worlds, torture and then kill off any less advanced creature they come across. When they are finished causing torment and chaos towards that planet, they will then turn it into a burning lifeless world.
The demons as a species are surprisingly very very old, meaning that, they have been around for untold eons. They possess technology that is capable of turning planets that were rich with life and flowing with water, into planets that are lifeless and flowing with lava, technology that is capable of stealing a person’s consciousness from their body, and placing it into a new body that is capable of withstanding fire and much much more.
The skin of the demons is capable of withstanding a high amount of heat and blunt force trauma, but it isn’t invulnerable to explosives, gun fire, and more. The home world of the demons, is surprisingly filled with life, albeit very dangerous life. The creatures, although being very intelligent, are very aggressive with one another, showing that they posse a more territorial like mentality. It is unknown why these demons hate life so much, but it’s theorized that the reason why they hate life so much is because they view it as being a plague upon existence.
what environmental pressures would lead to a species looking like humans with bird like heads and bat like wings, and what parts of the description are feasible and what isn’t?