Coconut rhinoceros beetles were first discovered on Guam in 2007. Adults abolish palms when they bore into crowns to feed on sap. Rhino beetle larvae feed only on dead plant fabric at breeding sites and they do no damage. In order to eradicate rhino beetles, all breeding sites must be found and destroyed. Four dogs were trained to lead handlers to cryptic breeding sites on Guam. This detector dog program was effective but very expensive and it was shut down after a few years.
Source: phys.org