Abstract: Capsule (1) for the electronic identification of ruminants, adapted to be administered orally and to be housed in the animal's second stomach, which comprises a body (2), of ceramic material and provided with a cavity (3) to enclose a data exchange device (4), which is characterized in that it comprises a compound of a non-ferrous element of a density equal to or over 4 g/cm3; it has a specific gravity of over 3; a total weight comprised between 8 g and 90 g; an effective weight between 5 g and 85 g; and it has an oblong shape, which is cylinder-like, with a ratio between the length and the diameter comprised between 3 and 6. The capsule (1) object of the invention, is applicable to animals of different weighs and measurements.