A female part of an animal-identifying device, which includes a cavity intended to receive a head of a male part of the animal-identifying device. The cavity includes a blocking element provided within the cavity to hold the head inside the cavity. The blocking element includes a base and at least two resilient claws extending from the base towards an entrance of the cavity. The claws are movable between several positions, including: a resting position before insertion of the head into the cavity, in which the claws are relaxed; an insertion position, in which the claws are stressed into opening; and a blocking position after insertion of the head into the cavity, enabling blocking of the head inside the cavity.