Use the "classic search" library catalog to look for specific subjects or keywords. Search for your taxa, using the common name and/or the scientific name. For example,
Results will generally include books or government documents. Science books will be located on the fourth floor. Government documents (often from the Smithsonian Institution) can be found in compact shelving on the first floor.
Science reference books, located on the third floor, may also be helpful. For example, take a look at:
Grzimek’s animal life encyclopedia, by Bernhard Grzimek.
Ref QL 7 .G7813 2003 17 volumes
Mammal species of the world : a taxonomic and geographic reference, edited by Don E. Wilson and DeeAnn M. Reeder. 3rd ed.
Ref QL 708 .M35 2005 2 volumes
These books on phylogenetics may help you as well:
Phylogenetics: the theory of phylogenetics systematics, by E.O. Wiley and Bruce S. Lieberman QH83 .W52 2011
Phylogenetic trees made easy: a how-to manual, by Barry G. Hall. QH 367.5 H27 2008
Tree of life: a phylogenetic classification, by Guillaume Lecointre and Hervé Le Guyader, trans. by Karen McCoy. QH 83 L42513 2006