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.
Borgo, Jennifer S. and Conover, Michael R.
"A Device to Record the Specific Time an Artificial Nest is Depredated,"
Human–Wildlife Interactions: Vol. 3
, Article 13.
Available at: http://digitalcommons.usu.edu/hwi/vol3/iss1/13