Due to their intellect, Orks might, at times, give the impression of confused little children. But I have never seen a little child that could tear someones spine out through ones rear.
~ Princess Islaya of the Iotegian
During the first five years in a live of an Ork the skin color will adapt to the environment of the Ork. After that his skin color will stop changing and fixate to a mix of all the previously acquired colors. For example: when a two year old Ork lives in a forest, he will turn dark green while the skin of an Ork that resides in the city will rather change to a grayish tint.