An unloading system for unloading at least one transport unit having at least one rack and at least one transport crate mounted for receiving poultry. The rack includes a transport restraint for each transport crate, which include a bottom and side walls. A cover arranged at a distance from the upper edge of the side wails. The system includes an unloading station for at least one transport unit, a pushing device for ejecting transport crates in an ejection position, and a receiving device for receiving and conveying ejected transport crates. In the ejection position, position of transport crate to the cover is vertically controllable during the entire ejection operation so a maximum distance between the upper edge of trailing side walls of the transport crates in the pushing direction and the cover are maintainable depending on the position of the transport crate within the rack during the ejection operation.
