Reference books are a great place to find background information on your topic. To search for books, use the library catalog Annie.
(HINT: There is an Annie search box on every library web page.)
Use bibliographic databases to search the scientific journal literature. The best for Animal Behavior are described and linked below.
A competitor to Web of Science, Scopus is also quite exhaustive, with a bit more focus on social and behavioral sciences.
A great resource to search the older scientific literature. Be sure to select your discipline(s) or journal(s) toward the bottom of the search screen.
Produced by the American Psychological Association, includes information on animal psychology. On the advanced search screen, select "animal" as your population.
To look for journal articles in particular journals, use the indicated search tool and tips for limiting your search to specific journals. The journal titles below are linked to either the journal's home page or the Annie catalog record.
American Economic Review
Journal of Animal Ecology
Proceedings of the National Academy of Sciences
Proceedings of the Royal Society of London B
Quarterly Review of Biology
Animal Behaviour (1999-present)
Hormones and Behavior (1999-present)
Trends in Ecology and Evolution (1999-present)
Trends in Cognitive Sciences (1999-present)
American Zoologist (2000-2001)
The Auk (2000-present)
The Condor (2000-present)
Journal of Arachnology(2000-present)
American Economic Review (previous 2 years not available in JSTOR)
Ecology (previous 5 years not available in JSTOR)
Science (previous 5 years not available in JSTOR)
American Naturalist (via University of Chicago 1997-present)
Annual Review of Ecology, Evolution and Systematics (via Annual Reviews)
Behavioral Ecology (via Oxford Journals 1998-present)
Journal of Zoology (via Blackwell-Synergy 1998-2005)
Quarterly Review of Biology (via University of Chicago 2002-present)