A device for sampling biological tissue (1) to be used in a label for marking animals includes: a hollow needle (3) having a cutting edge (36) at one end, capable of sampling a biological tissue sample when the sampling device is inserted into the biological tissue； a fixation part (22) of the hollow needle, made as a single piece and including a tank (2) containing a chemical for processing a biological tissue sample, the base of the tank including a partition (211) that is punctured by the needle when a pressure is applied upon the insertion of the sampling device into the biological tissue. After puncturing the partition, the content of the tank flow into the hollow needle and contacts the recovered sample. The end of the hollow needle containing the sample can further be protected by a cap, and the sample remains easily accessible for further analysis.
