There is an extensive network of monitoring equipment on both Pomona and Rona Islands. This includes:
Rat and mouse motels
A deer pen.
With mice re-established on both islands and a small breeding population of rats on Pomona, there is much to do. All devices are all checked regularly to understand the redator-status on the islands.
Late in 2012, an extensive bait station network was put in place on Pomona targetting rats. An extension to the trap network on Pomona was added to this in August 2013 to help maintain rat numbers at very low levels. A graph of the effect of this is available here.