This is Chappie AI true form he is billions of nano bots all put together to make his physical form, he uses the DNA of other species to become that particular species but in his own image. A sample could take him months to become a species he desires but a fresh dead body would take him several seconds or minutes. The only one to truly know his true form is Ballard.

Species is a closed species the name of this species is called Nano'Tágen and it is apart of the Suntauri universe

YES IK LOOKS LIKE THE PREDATOR BUT I ASSURE YOU THESE ARE TWO DIFFERENT SPECIES.

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