Specifically, we are interested in obtaining feathers from Eurasian reed warblers (Acrocephalus scirpaceus), African reed warblers (A. baeticatus) or marsh warblers (A. palustris).
This would enable Keith A. Hobson and me to ground-truth the stable isotopic (C, N, H) clusters identified by Hobson et al. (2012, Ecosphere) and improve the assignments of the birds to their African wintering grounds.