A bed bug detection device (10) comprises a refuge (16) and a non-trapping indicator surface (18), on which the bed bugs may leave indicators of their presence, such as faecal matter or cast skins. The non-trapping indicator surface takes the form of a skirt (18b) which surrounds and extends from the refuge. The bed bugs can leave an indicator of their presence as they travel across the indicator surface on their way to or from the refuge. The device is absent of trapping adhesives, which provides for passive observation of bed bug indicators only. Bed bugs, when captured, produce an alarm pheromone alerting others to danger. By avoiding entrapment of the bed bugs, alarm pheromones are not released and early detection of bed bugs can be achieved. A passive method of detecting the presence of bed bugs without their capture, including detecting the presence of indicators, is also disclosed.
