Try these
S
Hi top one is Reed Bottom is Marsh- slightly yellow tinge to bill base, legs and feet and no warm rufous on rump
Personally I think they have a less 'mean' expression- possibly less contrasty face pattern- often a grey cast on crown or nape S
Wendy S said:I use a similar expression ref Greater and Lesser Black Backed Gulls.
I find these much easier to tell apart than many warblers ....... except for the youngsters!