Since you need to choose an animal, you should make an early expedition to the Lower Level of the Science Library and scan the shelves starting around QL750 to see what our book resources look like. You will need to work with the journal literature as well, but 'animal behavior' is particularly well represented in books.
N.B.: W&L has holdings of about half of these journals. One way to choose an animal would be to see what the journals themselves have to offer in the way of research articles.
A search for 'ethology' in Annual Reviews is strongly suggested!
TITLE The Oxford companion to animal behavior / edited by David McFarland ; foreword by Niko Tinbergen. PUBLISHER Oxford ; New York : Oxford University Press, 1981. NOTE Includes indexes of English names and scientific names of animals. SUBJECT Animal behavior. Science Library QL751 .O930 AUTHOR Immelmann, Klaus. TITLE Worterbuch der Verhaltensforshung. English. A dictionary of ethology / Klaus Immelmann and Colin Beer. PUBLISHER Cambridge, Mass. : Harvard University Press, 1989. SUBJECT Animal behavior --Dictionaries. Science-Reference QL750.3 .I4513 1989 AUTHOR Grzimek, Bernhard. TITLE Tierleben. English. Grzimek's Animal life encyclopedia / Bernhard Grzimek, editor-in-chief. PUBLISHER New York : Van Nostrand Reinhold Co. [1972-75; v. 13, 1972] Science-Reference QL3 .G7813 v. 1-13 AUTHOR Nowak, Ronald M. TITLE Walker's mammals of the world. EDITION 5th ed. / Ronald M. Nowak. PUBLISHER Baltimore : Johns Hopkins University Press, 1991. SUBJECT Mammals. Mammals --Classification. Science-Reference QL703 .N69 1991 v. 1-2 TITLE Quantitative ethology / edited by Patrick W. Colgan. PUBLISHER New York : Wiley, c1978. SUBJECT Animal behavior --Mathematical models. Science Library QL751.65.M3 Q36 TITLE Quantitative methods in the study of animal behavior / edited by Brian A. Hazlett. PUBLISHER New York : Academic Press, 1977. SUBJECT Animal behavior --Mathematics --Congresses. Science Library QL751.65.M32 Q36 AUTHOR Lehner, Philip N., 1940- TITLE Handbook of ethological methods / Philip N. Lehner. PUBLISHER New York : Garland STPM Press, c1979. SUBJECT Animal behavior --Methodology --Handbooks, manuals, etc. Science Library QL751 .L398