System for marking a non-human biological object and taking a sample of the biological object, an object that in particular is an animal, the system comprising: - a first part of the tag (1), - a second part of the tag (2 ), - a plug (3), which has a first end and a second end, the plug being connected to the first crotch part at its first end and which is provided with a head (4) at its second end, - a sampling cap (20) which - during fixing the parts of the tag on the biological object and taking the sample thereof - is placed on the head (4) of the plug (3), in which the The cap has an annular blade, preferably circular, (21) in its front part, preferably with a cutting bush made of metal, a blade that delimits a sample receiving cavity (22) that is open at the front, in which the second part of the tag is provided with a passage (5) for the cap and the c pin (4) of the plug, - a sample container (10) with an insertion hole (11) for inserting the cap and the sample of the object that has been cut by the blade into the sample container, sample container ( 10) which is fixed to the second portion of the tag (2) by means of a removable connection, so that the insertion hole (11) of the sample container and the passage (5) of the second portion of the tag are aligned, the system -in use- that allows the pin to be pressed through a part of the biological object, in particular through the ear of an animal, thus cutting with the knife a sample (8) of the object, said sample being at least partially received in the sample receiving cavity (22), and so that the cap and the head pass through the passage (5) of the second portion of the tag (2), as a consequence of which the parts of the first tag and second are fixed with each other and with the biological object by means of l by plug, the cap and the sample that are introduced into the sample container, said cap sealing the insertion hole of the sample container, characterized in that the second portion of the tag is prov
