A portable bird scare device uses airflow to create random movement of a sock. For example, a portable bird scare device can be constructed from a toolbox, marine fan, waterproof switch, deep-cycle battery, fuse, ripstop nylon tube, plumbing pipe and plumbing pipe connectors. A switch can control power between the fan and a battery protected by the fuse. The fan can drive air from within the toolbox through pipe and connectors to the ripstop nylon tube. By controlling the dimensions of the ripstop nylon tube, the ripstop nylon tube can be made to alternatively rise and collapse. By constructing the bird scare device in this manner, it can be made to fit the needs of an airport for a portable, all day, quiet device that can be placed in fields and within confined spaces (such as under bridges, within window wells, etc.) to scare birds due to the movement.