Behavior or behaviour (see spelling differences) refers to the actions or reactions of an object or organism, usually in relation to the environment. Behavior can be conscious or unconscious, overt or covert, and voluntary or involuntary. In animals In animals, behavior's controlled by the endocrine system & the nervous system. The complexity of the behavior of an organism's related to the complexity of its nervous system. Generally, organisms with complex nervous systems have a greater capac… (More on Behaviour)