Fernandez-Cordeiro, A. and Costas, R., 1991. Sandwich terns Sterna sandvicensis feeding juveniles during autumn migration around the NW Iberian Peninsula. Seabird, 13, pp.70-71.

The Sandwich Tern Sterna sandvicensis is the tern most frequently observed off the Iberian Atlantic coast, being especially abundant in the Rias Bajas of Galicia (NW Iberian Peninsula), where it winters regularly in small numbers (about 260 individuals; Berrnejo et al. 1985, 1986). The Rias Bajas are the northern edge of the regular winter range in the Iberian Peninsula (Fernandez-Cordeiro & Costas in press).