In this note the preliminary results of a RAS-project (Retrapping Adults for Survival) on Common Terns are presented. Common Terns were colour-ringed in three colonies in Groningen Province, in 2007 and 2008. In 2008, 50 of the 77 previously ringed adults were resighted in the colonies in Delfzijl and Eemshaven.

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D. Hiemstra. (2008). De overleving van Visdiefjes Sterna hirundo: tussentijdse resultaten van een Gronings kleurringprogramma. Sula, 21(2), 66–71.