We find it difficult to distinguish between warblers particularly when we are in a new environment. Fortunately, with Naturetrek, you are usually surrounded by excellent birders who know exactly what you are looking at.
We had two warbler lifers on this trip. Great Reed Warblers were regularly seen while we were on the Danube Delta – distinguished mainly by their size.
Plus, at the coastal marshes near Vadu, we found several tiny Paddyfield Warblers with their distinctively strong pale stripe over the eye.