The present invention relates to the field of devices for studying behaviour of motile living organisms in a multiplexed array format. The present invention provides devices comprising a solid porous support having first and second surfaces, said first surface comprising an agent and/or condition delineating behavioural and/or physical barriers for motile living organisms, and, where behavioural, said barriers adapted for sensing by said living organisms and hence forcing said living organisms to remain localized within a predefined region of said support. In addition the invention provides methods for screening test molecules or effector molecules which affect behaviour, motility and/or health of a motile living organism.