Videos:
Species depletion
http://www.youtube.com/watch?v=EPCk7gHzZRI
http://www.youtube.com/watch?v=TZb348uSYZg 4.03 min
Resources:
Janson, C. (2000). Spatial Movement Strategies: Theory, Evidence and Challenges In Boinski, S., and Garber, P.A., ( Ed.), On the Move: How and Why Animals Travel in Groups. Chicago: University of Chicago Press, Ltd.