The Retrap Adults for Survival (RAS) scheme is a national standardised ringing programme within the BTO Ringing Scheme that has been running since 1999. Ringers aim to catch or re-sight at least 50 adult birds of a single species in a study area during the breeding season. The study area is well defined and the ringer is aiming to record the vast majority of the adults.
In 2014 there were over 180 projects throughout Britain and Ireland on species as diverse as House Sparrow, Moorhen, Pied Flycatcher and Manx Shearwater. The most recent scheme newsletter provides a full list of the species.
RAS is used to give adult survival rates and is particularly useful for those species not widely covered by CES.
The Retrappping Adults for Survival Scheme is supported by a partnership between the British Trust for Ornithology (BTO ) and the Joint Nature Conservation Committee (JNCC) (on behalf of: Council for Nature Conservation and the Countryside, Natural Resources Wales, Natural England and Scottish Natural Heritage). It is also part of the BTO Ringing Scheme which is funded by the BTO /JNCC Partnership, The National Parks and Wildlife Service (Ireland) and the ringers themselves.