The invention relates to a unit for marking and/or sampling animal tissue, including a male portion (12) for marking and/or sampling tissue, and a female portion (13) for marking and/or receiving said tissue. According to the invention, such a unit includes an intermediate element (14) for connecting said male and female portions together, said intermediate connection element (14) having a first portion (141) for rigidly connecting to said male portion and a second portion (192) for rigidly connecting to said female portion, enabling said male and female portions to be supported along a single marking and/or sampling axis (AA1) before marking and/or sampling said animal tissue, wherein the intermediate connection element is releasable.