US Patent 7212112 Detection and control of pests

Among the embodiments of the present invention are pest control devices (1010, 1110, 1210) each operable to detect the presence of pests. The pest control device (1010, 1110, 1210) has a bait (1032) that is consumed or displaced by one or more species of pest, a pest sensing circuit (1052, 1152, 1252), and a monitoring circuit (1069, 1169, 1269). The pest sensing circuit (1052, 1152, 1252) can be altered by pest activity. The monitoring circuit (1069, 1169, 1269) detects this alteration and reports it automatically or in response to an external stimulus or interrogation to indicate pest presence.