594584 A device (10) for detecting insects, such as bed bugs, 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 refuge is positioned in close proximity to the non-trapping indicator surface such that 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 non-trapping indicator surface is slightly absorbent so that indicators mark or stick to the indicator surface, and is a colour which contrasts that of bed bug indicators for ease of visual indication. A passive method of detecting the presence of bed bugs without their capture by detecting the presence of indicators is also disclosed.
