From BirdLife:
Road to recovery for rare cuckooshrike
06-09-2006
Implementation of the Reunion Cuckooshrike Coracina newtoni action plan is producing rapid results
Control of predatory rats and cats is a key recommendation of the plan, and already in Réserve Naturelle de La Roche Ecrite in northern La Réunion (Indian Ocean) it has led to four out of five pairs of cuckooshrike successfully rearing chicks, compared to just two out of six pairs raising young at a nearby site without control.
Eastern loggerhead shrike in Canada: here.