Dartford warbler
These are small, long tailed, large-headed birds, overall very similar to their close relatives in the Dartford warbler group. Marmora's warblers are grey above and below, lacking the brick-red underparts of the Dartford warbler. Adult males have darker patches on the forehead and between the eye and the pointed bill. The legs and iris are red. The song is a fast rattle. Immature birds can be confused with young Dartford warblers, which are also grey below, but Marmora's have a paler throat. Their iris is dark.