The invention relates to a freewheel hub for a bicycle including an axle and housing rotatably mounted thereon. In a first mode of operation, the apparatus automatically rotates the avian enclosure at a slow speed when a bird is detected, and automatically rotates the avian enclosure at a faster speed when a larger animal, such as a squirrel, is detected. To certify a particular computer, one or more testing algorithms or routines for processing data, e.