Sentence case species common names policy Wikipedia has adopted a policy in common with most if not all other encyclopedias as well as the majority of other works in formal prose of using sentence case for common names of species of mammals as well as for species of most other types since such names are not proper nouns this policy is given here According to this rule the term ucucha a Quechua mammal common name should be given in sentence case since it is a common noun It should be noted that sentence case typography rules are not necessarily applied to lists titles or other printing that is not part of prose sentences Thus the typography used in the MSW3 common name listing which is always given in title case can not be taken as evidence that the authors of the book would use the same typography in prose Furthermore even if MSW3 were to use a title case common name in prose that would have no relevance here since the Wikipedia policy is based on the distinction between proper and common nouns regardless of the typography used by MSW3 or any other source