 Many philosophers and scientists have either argued or assumed that consciousness is inherently private, and hence that one's own experience is unknowable to others. While language may allow humans to cross this supposed gap by communicating their experience to others, this is allegedly not possible for other animals.  Despite the controversy in philosophical and scientific circles, it remains a matter of common sense to most people that some animals do have conscious experiences. Most people, if asked why they think familiar animals such as their pets are conscious, would point to similarities between the behavior of those animals and human behavior — for example, animals seem to visibly express pleasure and displeasure and a variety of emotions, their behavior seems to be motivated by seeking food, comfort, social contact, etc., they seem aware of their surroundings and able to learn from experience. Similarity arguments for animal consciousness thus have roots in common sense observations. But they may also be bolstered by scientific investigations of behavior and the comparative study of brain anatomy and physiology, as well as considerations of evolutionary continuity between species. Neurological similarities between humans and other animals have been taken to suggest commonality of conscious experience; all mammals share the same basic brain anatomy, and much is shared with vertebrates more generally. Even structurally different brains may be neurodynamically similar in ways that enable inferences about animal consciousness to be drawn (Seth et al. 2005).  