Orange ring with a three alpha code (AAA, AAB, …) (on right tibia).
note 1 : about 200 birds have been ringed with metal rings (on left tibia) coded CEMO INST. SCI. RABAT (series MA 0001 till MA 1000). These rings are 18mm. on diameter and 12mm. high.
note 2 : the letters F, G, J, K, O and Q are NOT used.