Apparatus for deterring birds and animals from roosting on boat decks and other surface areas in form of a mechanical repeller includes a bracket for attachment to a surface area, and a housing including a quick-release fastening device to connect the housing with the bracket. The quick-release fastening device forms a pivotable bearing between the housing and the bracket. At least one pole extends from the housing and a bearing supports the housing in the bearing. An electric motor turns the housing and thereby moves the pole above the surface area. The electric motor includes an output shaft which engages the bracket axially detachable but torque proof. A rechargeable battery is provided and supplied with electric power from a solar cell. The housing is configured in form of a closed module which accommodates the solar cell, an electronic control unit, the electric motor, and the rechargeable battery.