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Ratcon is a brand of pest control used to kill birds and rodents. It is harmful to Birds of Prey who eat rodents that have been poisoned with it.
Generally speaking, the answer is "Birds of Prey." Hawks, Shrikes, Eagles, Osprey...and within issues of nest robbing, "Squirrels." http://www.britishcolumbia.com/wildlife/wildlife/birds/cw/cw_downywoodpecker.html