RAS stands for Retrapping Adults for Survival: in other words species-specific research on survival of Dutch breeding birds.

In a fixed study area a given species is being studied in detail. Thus, a fixed recapture- or reading- effort is aimed at obtaining 20-30 recaptures minimally for adult breeding birds.

For more information about RAS projects see the website from the BTO see RAS.

Colour ringing projects in the context of RAS are done by me on the following species:
* In these RAS projects only a metal ring is used from the Vogeltrekstation Arnhem. The other species are also given a colour ring.
© Frank Majoor. Website update 10-09-2013.