The inventive device for automatically detecting the mating of animals is wearable by an animal. The device includes a fixing to an animal mechanism, a detector for an attempt of mating a female animal by the animal with the fixing mechanism, and an identifier for an electronic label which is introduced in the body of the female animal and actuated by the detector and/or by the female animal identification device by processing the image of at least one part of the female animal triggered by the detector. The identifier includes a communicator with an electronic label carried by a female animal. The communicator can read the electronic label identifier of each female animal which the animal attempts to mate. The communication can also be provided with a device for storing representative information on the attempted mating in the random access memory of the electronic label.