Dogs and wolves are actually from the same species: Canis lupis. Physically and genetically, these two canines are similar, but behaviorally, it has been difficult for biologists to understand why wolves remain fiercely wild, while dogs are content on being man’s companion. While domestication of the dog plays a huge role in the differences between the two, according to new research, evolutionary biologist Kathryn Lord at the University of Massachusetts Amherst suggests the different behaviors are related to the animals’ earliest sensory experiences and the critical period of socialization.