(Downloading may take up to 30 seconds.
If the slide opens in your browser, select File -> Save As to save it.)
Click on image to view larger version.


Figure 1


Fig. 1. Hypothetical relationship between predation cost and trap angle. The shaded part of the graph corresponds to angles greater than crater angle ({alpha}c), which cannot be achieved because of the physical properties of sand. {alpha}WO is the theoretical angle without off-centring.