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'''Behavior''' or '''behaviour''' (see [[American and British English spelling differences#-our .2F -or|spelling differences]]) refers to the [[action (philosophy)|action]]s or [[reaction]]s of an [[object (philosophy)|object]] or [[organism]], usually in [[relation]] to the [[natural environment|environment]]. Behavior can be [[conscious]] or [[Unconscious mind|unconscious]], [[overt]] or [[covert]], and [[voluntary]] or involuntary. In animals, behavior is controlled by the [[endocrine system]] and the [[nervous system]]. The complexity of the behavior of an organism is related to the complexity of its nervous system. Generally, organisms with complex nervous systems have a greater capacity to learn new responses and thus adjust their behavior.

'''Behavior''' or '''behaviour''' (see [[American and British English spelling differences#-our .2F -or|spelling differences]]) refers to the [[action (philosophy)|action]]s or [[reaction]]s of an [[object (philosophy)|object]] or [[organism]], usually in [[relation]] to the [[natural environment|environment]]. Behavior can be [[conscious]] or [[Unconscious mind|unconscious]], [[overt]] or [[covert]], and [[voluntary]] or involuntary. In animals, behavior is controlled by the [[endocrine system]] and the [[nervous system]]. The complexity of the behavior of an organism is related to the complexity of its nervous system. Generally, organisms with complex nervous systems have a greater capacity to learn new responses and thus adjust their behavior.