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Klug PE, Jackrel SL, With KA. Linking snake habitat use to nest predation risk in grassland birds: the dangers of shrub cover. Oecologia. 2010;162:803 -813. doi:10.1007/s00442-009-1549-9.

Klug PE. Interactions between grassland birds and their snake predators: the potential for conservation conflicts in the tallgrass prairie.  2009;PhD dissertation:1 -126. Available at: http://hdl.handle.net/2097/2184  .