Disclosed is a system for marking a non-human biological object using an eartag and removing a biological sample of the animal as part of the same process in applying the eartag. The system comprises: - a first tag part (1), - a second tag part (2), - a pin (3) connected to the first tag part by its first end and provided with a head (4) at its second end, - a sample removing stopper (20) which - while attaching the tag parts on the biological object and removing the sample therefrom - is positioned on the head of the pin. The stopper has a cutter at its front (21), which cutter delimits a sample receiving cavity (22). The second tag part is provided with a passage (5) for the stopper and the head of the pin. The system also has a sample container (10) with an introduction opening (11) for introducing into the sample container the stopper and the sample of the object that has been cut by the cutter, which sample container is attached to the second tag part via a releasable connection. The second tag part is provided in the region of the passage of the second tag part with a sample fixating spike member (30).
