Ringing in the changes: Sandwich terns in South Africa
alpha-numeric code|bird behaviour|bird ringing|bird sightings|breeding sites|British Isles|camera|cape agulhas|colour rings|Eerste River mouth|engraved rings|false bay|field-readable|flag rings|Gansbaai|Greenways beach|Macassar|metal rings|migration|national ringing organizations|non-breeding|Sandwich terns|telescope|Thalasseus sandvicensis|Theuns Kruger