Wildlife Damage Management, Internet Center for


Date of this Version

Spring 2009


Published in Human–Wildlife Conflicts 3(1):88–92, Spring 2009. Published and copyright by Jack H. Berryman Institute http://www.berrymaninstitute.org/journal/index.html


We designed a timing device that records the calendar date and time of a depredation event on an artificial nest. The clock was simple to construct and successful in field trials, with only 6% failure (3 of 48 clocks). The average difference between actual and estimated depredation time was 4.6 minutes. Use of this clock improves daily survival estimates, provides insight into predator activity patterns, and allows the evaluation of investigator-induced depredation.